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Windows 7: Black screen at login

25 Nov 2011   #1

Windows 7 Ultimate x64
 
 
Black screen at login

I am having a really annoying problem with my computer. My specs are:
  • Intel core 2 duo 3.0 GHz CPU
  • 3 GB DDR2 RAM
  • Gigabyte EP31-DS3L motherboard (no onboard graphics)
  • Windows 7 Ultimate – 64 bit
  • ATI Radeon HD 4650 graphics card - 1 GB (using HDMI port)
When I start the computer the POST and windows 7 “Starting Windows” screens come up as normal. However when that’s finished instead of displaying the welcome screen I get a black screen, no cursor, no buttons, no text and the keyboard can’t be used for anything.

If I boot into safe mode and then restart and boot normally it works as if there was no problem. If I shut the computer down and turn it back on – the black screen is back. I’ve noticed that when I start the computer the POST ‘beep’ takes longer to happen than usual. Occassionally it boots normally the first time but not often. I’ve been searching the internet for a solution and anything I’ve tried so far hasn’t worked.

Here’s what I’ve tried:
  • Uninstalling and reinstalling updated graphics drivers
  • Swapping from HDMI to VGA
  • Running start up repair
  • Repaired MBR
  • Repaired boot sector
  • Used system restore to known working date
  • Have all recent windows updates
  • Virus scans (Trend micro, super-anti-spyware, TDSS killer)
  • Dual boot with same OS and drivers
  • Ran memtest86+ for 9 hours
If anyone has any suggestions, that would be very much appreciated.

My System SpecsSystem Spec
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 Black screen at login




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