Black screen in Windows Vista.

Hi,

1st I would clear general corruption and repair/replace damaged/missing system files :

Start - type this in Search Box ->  COMMAND   find at top and RIGHT CLICK  -  RUN AS ADMIN

Enter this at the prompt - sfc /scannow

How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program
generates in Windows Vista cbs.log
http://support.microsoft.com/kb/928228

Run checkdisk - schedule it to run at next start and then Apply OK your way out then restart.

How to Run Check Disk at Startup in Vista
http://www.vistax64.com/tutorials/67612-check-disk-chkdsk.html

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Check Settings (BIOS/CMOS) as you boot and make sure that Wake on lan, Wake on modem and
similar are not enabled.

Trouble shoot sleep - hibernate
http://www.computerperformance.co.uk/vista/vista_hibernate.htm

How to Troubleshoot a Vista Sleep Mode Problem and Find a Solution
http://www.vistax64.com/tutorials/63567-power-options-sleep-mode-problems.html

How to enable and disable Hibernation - you can try disabling it and reenabling it.
http://www.vistax64.com/tutorials/165508-hibernation-enable-disable.html

How to restore the default power plans in Vista (then go back and change as desired)
http://www.vistax64.com/tutorials/198047-power-plan-restore-default-settings.html

How to troubleshoot performance issues with standby, hibernate, and resume in Windows Vista
http://support.microsoft.com/kb/950686

Control Panel - Device Manager - look at Power Management settings for Network Card, WiFi, Modem,
and other devices. (Double click the device and Power Management Tab)

Set ALL power plans to the default and then set them as you wish.

Hope this helps.

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Rob - Bicycle - Mark Twain said it right.