“脱北者”(左)与朝鲜代表(右)起争执。(图片来源：美联/新华)
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“脱北者”中以手拭泪。新华/美联
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美国常驻联合国代表萨曼莎·鲍尔(左)安慰一名“脱北者”(右)。(新华/美联)
联合国4月30日举行一场人权讨论会议，美国组织多名“脱北者”参加。朝鲜代表怒斥美国炮制伪证，并援引美国巴尔的摩骚乱事件，指称美国才是严重侵犯人权的国家。
美方外交官要求关闭朝鲜代表的麦克风。朝鲜代表高声朗读完发言稿，而后起身愤然离去。
朝方派出多名外交官参加这次会议。会议一开始，由美国组织的3名“脱北者”逐一发言，哭诉自身悲惨遭遇。
当第二名“脱北者”准备发言时，朝鲜代表李成哲（音译）决定不再当听众，而是朗读自己的发言稿。会议协调员、美国常驻联合国代表萨曼莎·鲍尔见状，要求工作人员立即关闭朝鲜代表的麦克风，并叫来安保人员。
虽然鲍尔一再叫停，李成哲却坚持读完发言稿。他说，美国人权状况糟糕，“无辜的非洲裔公民被残害”。发生在巴尔的摩和弗格森的事件证明，美国才是侵犯人权的“轴心国”。
李成哲同时表示，当天的讨论是美国“一手导演的政治闹剧”。他发言结束后，与朝鲜外交官们一同愤然离去。
今年3月，联合国人权理事会通过一项朝鲜人权决议。朝鲜外务省发言人随后发表声明予以谴责。
这名发言人表示，所谓朝鲜“人权问题”是美国等敌对势力根据“脱北者”所做伪证炮制出来的，美国及其追随势力多次赞成通过朝鲜人权决议，是为了转移国际社会对美国侵犯人权行为的关注。发言人警告美国不要再以“人权法官”自居，干涉别国内政。
美国近期频发针对非洲裔人群的暴力执法事件，引发多轮抗议活动。4月12日，25岁的巴尔的摩非洲裔青年弗雷迪·格雷遭警方逮捕，后因脊椎严重受伤死亡。他的“非正常”死亡事件引发民众不满。不少人在市政厅、警察局外及主要街区举行示威，抗议警察暴力执法并要求警方公布事件真相。
去年8月9日，密苏里州弗格森市白人警官达伦·威尔逊开枪打死18岁的非洲裔青年迈克尔·布朗。威尔逊后被免于起诉，引发全国性示威浪潮。
文/张旌（新华社特稿）
iMac: How to remove or install memory
Choose your model
To identify your iMac model, use the information in How to identify iMac models.
| 17-inch | iMac (17-inch, Late 2006 CD) iMac (17-inch, Late 2006) iMac (17-inch, Mid 2006) iMac (17-inch, Early 2006) |
| 20-inch | iMac (20-inch, Early 2009) iMac (20-inch, Early 2008) iMac (20-inch, Mid 2007) iMac (20-inch, Late 2006) iMac (20-inch, Early 2006) |
| 21.5-inch | iMac (21.5-inch, Mid 2014)* iMac (21.5-inch, Late 2013)* iMac (21.5-inch, Mid 2012)* iMac (21.5-inch, Mid 2011) iMac (21.5-inch, Mid 2010) iMac (21.5-inch, Late 2009) |
| 24-inch | iMac (24-inch, Early 2009) iMac (24-inch, Early 2008) iMac (24-inch Mid 2007) |
| 27-inch | iMac (Retina 5K, 27-inch, Late 2014) iMac (27-inch, Mid 2013) iMac (27-inch, Mid 2012) iMac (27-inch, Mid 2011) iMac (27-inch, Mid 2010) iMac (27-inch, Late 2009) |
*Note: Memory is not user-removable on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), and iMac (21.5-inch, Mid 2014) computers. Memory replacement for these computers must be done by an Apple Retail Store or Apple Authorized Service Provider.
Applicable models
- iMac (Retina 5K, 27-inch, Late 2014)
- iMac (27-inch, Mid 2013)
- iMac (27-inch, Mid 2012)
Memory specifications
These iMac models have these memory specifications:
| Number of memory slots | 4 |
| Base memory | 8 GB |
| Maximum memory | 32 GB |
Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:
- PC3-12800
- Unbuffered
- Nonparity
- 204-pin
- 1600MHz DDR3 SDRAM
Removing or installing memory
Warning: The internal components of your iMac computer can be warm. If you have been using your iMac computer, wait ten minutes after shutting down the computer to let the internal components cool before continuing.
To install memory, follow these instructions.
- Turn off your computer by choosing Shut Down from the Apple () menu.
- Disconnect the power cord and all other cables from your computer.
- Place a soft and clean towel or cloth on the desk or other flat surface to prevent scratching the display.
- Hold the sides of the computer and slowly lay the computer face-down on the towel or cloth.
- Open the memory compartment door by pressing the small grey button located just above the AC power port.
- The memory compartment door will open as the button is pushed in. Remove the compartment door and set it aside.
Note: There is a diagram on the underside of the compartment door showing the memory cage levers and the orientation of the DIMM.
- Locate two levers on the right and left sides of the memory cage. Push the two memory cage levers outward to release the memory cage.
- Once the memory cage is released:, pull the memory cage levers toward you, allowing you to access each individual DIMM slot.
- Remove a DIMM by pulling the module straight up and out.
- Replace or install a DIMM by setting it down into the slot and pressing firmly until you feel the DIMM click into the slot.
Note: The DIMM slot shown below is for the the iMac (27-inch, Mid 2013) which requires you insert the DIMM with the notch on the bottom oriented towards the right.
- Once you have all of your DIMMs installed, push the memory cage levers back into the housing until they subtly click back into place.
- Replace the memory compartment door. There is no need to depress the compartment door release button when replacing the compartment door.
- Place the computer in its upright position. Reconnect the power cord and all other cables to the computer, then start up the computer.
Additional Information
See Mac computers: About startup tones if you hear tones after installing or replacing memory.
Applicable models
- iMac (27-inch, Mid 2011)
- iMac (21.5-inch, Mid 2011)
- iMac (27-inch, Mid 2010)
- iMac (21.5-inch, Mid 2010)
- iMac (27-inch, Late 2009)
- iMac (21.5-inch, Late 2009)
Memory specifications
These iMac models have the following memory specifications.
| Number of memory slots | 4 |
| Base memory | 4 GB (but is configured to order) |
| Maximum memory | 16 GB Note: For the iMac (Late 2009) models, you can use 2 GB or 4 GB RAM SO-DIMMs of 1066 MHz DDR3 SDRAM in each slot. For the iMac (Mid 2010) and iMac (Mid 2011) models, use 2 GB or 4 GB RAM SO-DIMMs of 1333 MHz DDR3 SDRAM in each slot. |
Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:
| iMac (Mid 2011) | iMac (Mid 2010) | iMac (Late 2009) |
| PC3-10600 | PC3-10600 | PC3-8500 |
| Unbuffered | Unbuffered | Unbuffered |
| Nonparity | Nonparity | Nonparity |
| 204-pin | 204-pin | 204-pin |
| 1333MHz DDR3 SDRAM | 1333MHz DDR3 SDRAM | 1066MHz DDR3 SDRAM |
Notes: i5 and i7 Quad Core iMac computers come with both top memory slots populated. These computers will not start up if only a single DIMM is installed in any bottom slot; these computers should operate normally with a single DIMM installed in any top slot. Core Duo iMac computers should operate normally with a single DIMM installed in any slot, top or bottom. ("Top" and "bottom" slots refer to the orientation of the slots in the pictures below. "Top" refers to the slots closest to the display; "bottom" refers to the slots closest to the stand).
Removing or installing memory
Warning: The internal components of your iMac computer can be warm. If you have been using your iMac computer, wait ten minutes after shutting down the computer to let the internal components cool before continuing.
To install memory into the bottom slot, follow these instructions:
- Turn off your computer by choosing the Apple () menu, then Shut Down .
- Disconnect all cables and the power cord from your computer.
- Place a soft, clean towel or cloth on the desk or other flat surface to prevent scratching the LCD display.
- Hold the sides of the computer and slowly lay the computer face down.
- Using a Philips screwdriver, remove the RAM access door in the bottom of your computer.
- Remove the access door and set it aside.
- Untuck the tab in the memory compartment. If you are replacing a memory module, gently pull the tab to eject any installed memory module.
- Insert your new or replacement SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown below.
- After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly.
- Tuck the tabs above the memory DIMMs, and reinstall the memory access door.
- Stand the computer in its upright position, reconnect the power cord and all other cables to the computer, then start up the computer.
Applicable models
- iMac (24-inch, Early 2009)
- iMac (20-inch, Early 2009)
- iMac (24-inch, Early 2008)
- iMac (20-inch, Early 2008)
- iMac (24-inch Mid 2007)
- iMac (20-inch, Mid 2007)
Memory specifications
These iMac computers have two side-by-side Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer.
The maximum amount of random-access memory (RAM) you can install in the computer is:
| Computer | Memory Type | Maximum Memory |
| iMac (Mid 2007) | DDR2 | 4GB (2x2GB) |
| iMac (Early 2008) | DDR2 | 4GB (2x2GB) |
| iMac (Early 2009) | DDR3 | 8GB (2x4GB) |
You can use a 1GB or 2 GB RAM module in each slot for iMac (Mid 2007) and iMac (Early 2008). Use 1GB, 2GB, or 4GB modules in each slot for the iMac (Early 2009).
Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:
| iMac (Mid 2007) | iMac (Early 2008) | iMac (Early 2009) |
| PC2-5300 | PC2-6400 | PC3-8500 |
| Unbuffered | Unbuffered | Unbuffered |
| Nonparity | Nonparity | Nonparity |
| 200-pin | 200-pin | 204-pin |
| 667MHz DDR2 SDRAM | 800MHz DDR2 SDRAM | 1066MHz DDR3 SDRAM |
DIMMs with any of the following features are not supported:
- Registers or buffers
- PLLs
- Error-correcting code (ECC)
- Parity
- Extended data out (EDO) RAM
Removing or installing memory
Warning: The internal components of your iMac computer can be warm. If you have been using your iMac computer, wait ten minutes after shutting down the computer to let the internal components cool before continuing.
To install memory into the bottom slot, follow these instructions:
- Turn off your computer by choosing the Apple () menu, then Shut Down .
- Disconnect all cables and the power cord from your computer.
- Place a soft, clean towel or cloth on the desk or surface to prevent scratching the LCD display.
- Hold the sides of the computer and slowly lay the computer face-down.
- Using a Philips screwdriver, remove the RAM access door in the bottom of the computer.
- Remove the access door and set it aside.
- Untuck the tab in the memory compartment. If you are replacing a memory module, untuck the tab and pull it to eject any installed memory module.
- Insert your new or replacement RAM SO-DIMM into the empty slot, noting the orientation of the keyway of the SO-DIMM as shown above.
- After you insert it, press the DIMM up into the slot. There should be a slight click when you seat the memory correctly.
- Tuck the tabs above the memory DIMMs, and reinstall the memory access door.
- Stand the computer in its upright position, reconnect the power cord and all other cables to the computer, then start the computer.
Applicable models
- iMac (20-inch Late 2006)
- iMac (17-inch, Late 2006 CD)
- iMac (17-inch, Late 2006)
- iMac (17-inch, Mid 2006)
- iMac (20-inch, Early 2006)
- iMac (17-inch, Early 2006)
Memory specifications
Installing memory in the bottom slot
Important: When installing SDRAM DIMMs into the computer, press the DIMM up into the slot with your thumbs; do not use the DIMM ejector clips. Trying to push the DIMM into the slot using the ejector clips may damage the SDRAM DIMM.
To install memory into the bottom RAM slot, follow these instructions:
- Turn off your computer by choosing the Apple () menu, then Shut Down.
- Disconnect all cables and the power cord from your iMac.
- Place a soft, clean towel or cloth on the desk or surface to prevent scratching the LCD display. Hold the sides of the computer and gently lay the computer face down.
- Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac, as shown below.
- Remove the access door and set it aside.
- Move the DIMM ejector clips to their fully open position.
- Insert your RAM SO-DIMM into the bottom slot, keeping in mind the orientation of the keyed SO-DIMM as shown.
- After you insert it, press the DIMM up into the slot with your thumbs. Do not use the DIMM ejector clips to push in the DIMM . Trying to push the DIMM into the slot using the ejector clips may damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
- Close the ejector clips.
- Reinstall the memory access door.
- Lift the iMac back to its normal upright position and reconnect the power cord and all other cables. Your computer is ready to start up now.
Replacing memory in the top slot
Important: When installing SDRAM DIMMs into the computer, press the DIMM up into the slot with your thumbs; do not use the DIMM ejector clips. Trying to push the DIMM into the slot using the ejector clips may damage the SDRAM DIMM.
To replace memory into the top RAM slot:
- Turn off your computer by choosing the Apple () menu, then Shut Down.
- Disconnect all cables and the power cord from your iMac.
- Place a soft, clean towel or cloth on the desk or surface to prevent scratching the LCD display. Hold the sides of the computer and gently lay the computer face down.
- Using a Phillips screwdriver, remove the RAM access door on the bottom of the iMac, as shown below.
- Remove the access door and set it aside.
- Pull the two levers on each side of the memory compartment to eject the memory module that's already installed.
- Remove the memory module from your iMac as shown below.
- Insert your RAM SO-DIMM into the top slot, noting the orientation of the keyed SO-DIMM as shown below.
- After you insert it, press the DIMM up into the slot with your thumbs. Do not use the DIMM ejector clips to push in the DIMM. Trying to push the DIMM into the slot using the ejector clips may damage the SDRAM DIMM. There should be a slight click when you seat the memory fully.
- Cose the ejector clips as shown below.
- Reinstall the memory access door.
- Lift the iMac back to its normal upright position and reconnect the power cord and all other cables. Your computer is ready to start up now.
Learn more
After installing additional memory, you should confirm that the computer recognizes the new memory. To check the computer's memory:
- Start up your computer.
- Choose About This Mac from the Apple () menu.
The total memory listed thre includes the amount of memory that originally came with the computer plus the new memory you added, or if all the memory has been replaced, the new total for that memory. For detailed information about the amount of memory installed in your computer, open System Profiler by clicking More Info. Then, choose Memory from the Hardware section that appears in System Profiler.
If your computer doesn't recognize the memory or doesn't start up correctly, confirm that the memory you installed is compatible with your iMac and that it is installed correctly by reseating the memory.