I was going to bed and I put it into hibernation mode like I always do then the next day I get home I go to turn it on and it turns on but the screen stayed black. The power lights were all on and I could hear the laptop running but the screen stayed black and no matter how many times I turn it on and off it just stayed black

SOURCE: Black Screen / Computer Stays in Standby Mode

Completely remove the battery and unplug the power cord for a few minutes. Reinsert battery and power up. You can also hit F8 when starting and see if you can boot into safe mode.

SOURCE: Toshiba laptop won't wake up from stand by or hibernate

I had the same problem on my Toshiba Satellite U305, struggling with it for the past 4 months and having to use Shutdown each time I was done using it. Very frustrating! Toshiba worked with me several weeks, telling me to re-install Vista and all the fixes, which took a lot of work backing up etc and this did not fix the problem. Today they finaly told me to try entering this special command and it fixed my problem. Maybe it will fix yours too.

Create a shortcut on the desktop and to make the shortcut, right click on the desktop, choose Create Shortcut, enter CMD.EXE where it asks you to "Enter the location of the item". This will create an icon on the desktop that looks like a mini-command prompt. Then on the desktop, RIGHT click on the CMD.EXE shortcut/icon you have created and select "Run as administrator". This will open a command prompt window. Here in the black-box with white letter window, enter the command "powercfg -h on" (without the quotes). Reboot and see if the problem is resolved. This fixed my Toshiba Satellite that had this problem.

SOURCE: Acer Aspire one screen stays black

i have this problem 2 days ago.. and this works on me... maybe on your's too you may need to flash your bios. why need to flash the bios.. ? 1. had the black screen of death. or deleted the bios how to flash the bios: STEP 1.download the AA1 BIOS from this link: http://www.acerpanam.com/synapse/data/7117/documents/AS1_BIOS_3309.zip 2. extract the file 3. rename the file 3309.fd to zg5ia32.fd 4. put zg5ia32.fd and FLASHIT.EXE onto the usb drive now, start the process STEP 2 A. make sure the power cable is in B. the laptop is turned OFF C. Plug the usb stick in! STEP 3: Press and HOLD down the FN and ESC key together then press the power button, while holding the buttons release the power button and continue holding FN and ESC for about 5 seconds release the buttons and the power light will start to blink let the laptop run and DO NOT PRESS anything this can take upto 8 mins when it's done the laptop will restart. this works on me... good luck.. and i hope it will help you.....

SOURCE: Dell Inspiron 6000 screen goes black / hibernates / turns off

well go to your power setting by clicking on the battery by the clock and then say power options to change those setting such as Hibernating sleep ect... you can also get to this by going to you control panel then power options hope this helps

SOURCE: Screen is black after sleep/hib, Dell studio XPS, Vista.

Hibernate problems are generally associated with the Video Driver. Suggestions:

1. Update the BIOS to the current release. Here is the latest for the 1645. http://support.dell.com/support/downloads/driverslist.aspx?c=us&cs=04&l=en&s=bsd&ServiceTag=&SystemID=STUDIOXPS1645&os=WV64&osl=en&catid=&impid=
2. Update the video driver.