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My ibm thinkpad a21m runs ubuntu 12.04 and was left in sleep mode for a couple of days and now will not turn back on. just givesme a black screen. its like it turns on but doesn't do anything. no mouse and no wireless card lights. so what do i do ?

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It sounds like it may be in hibernation mode. If it sounds like the PC is fully booted but just not showing a screen it may be that your window manager crashed. Try pressing to get a console window to reboot ($ sudo reboot). Otherwise try powering the system off by pressing and holding the power key or try the reset button (usually recessed i a hole) if you have one. If that doesn't work you may need to remove the power and let the battery die or remove it, to reset the machine. Be ready to reinstall Ubuntu from media. It can be while preserving your old files, if you configured your '/' and '/home' directories on separate partitions. If not you can possibly create that arrangement using the live CD before reinstalling.

Posted on Nov 11, 2014

  • hdemby Nov 11, 2014

    'try pressing ctrl F2' was cut due to control characters in 3rd sentence the suggestion above.

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SOURCE: IBM Thinkpad A21M

your cmos motherboard battery is flat and needs replacing

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plz formatting your computer

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Go to youtube.com then type on its search bar " installing ram module " or something about ram or memory placement for videos and step by step procedure. If desktop add desktop word in the search bar or laptop if you have laptop unit.

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try to plug in a extrernal monitor and see if that works if it does your backlight went out

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I want to turn my screen in sleep mode so my power use go down while listening music can anyone help?


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Hello sandee232,

The following key combinations can be used for screen brightness:
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The screen brightness information can be located inthe IBM ThinkPad A21m User guide:
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If this solution is helpful please click a thumbs-up rating below.

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first, remove any external device as well as the ac adapter and the battery. while the ac adapter and battery is out, press and hold the power button for about 15seconds. then reconnect any power source and turn on the system. if it still doesnt turn on, remove memory, expansion cards, hard drive and optical drive then turn on the system. if it's still not turning on, the motherboard is faulty. but if it do turned on, reconnect the removed components one by one so you will determine which component is causing the issue. hope it'll help. good day. =)

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