Random BSOD Please check

Problem description
My problem is as follows:
  • When the computer has been turned off for at least a few hours, I'm getting BSOD's while booting but it is rarely.
  • When cold booting (computer has been turned off for at least several hours), I get a BSOD just after the Windows 7 `Starting Windows` logo screen.
  • The BSOD message differs:pAGE_FAULT_IN_NON_PAGED_AREA, and sometimes IRQL_NOT_LESS_OR_EQUAL.
  • The computer boots, but gives a BSOD after a few secs on the desktop.
  • The computer boots, but when you left it doing nothing for 5-10 mins then it will crash in random times.
  • After a succesful boot, Windows runs perfectly, including games (e.g. NFS The Run etc @ max most heavy games runs perfectly).

  • I have reinstalled Windows a few times, and I tried different Catalyst drivers (12.2, 12.3 and 12.4), and various (including latest) motherboard BIOSes.
  • Tested memory with memtest usually 9passes per stick, replaced PSU, tried scanning hdd for errors/ installing OS to another HDD`s - still no solution.
  • Tried sfc /scannow -no error found/ diver verifier - didn't crash when activated.


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