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New PSU, shuts off
AcerPower SK50, replaced a failed PSU (SHAW EVO 775Max) with a new PSU (SHAW EVO 975Max). Booted into Windows 7 fine. Shut down, removed the CPU heatsink/fan to removed the dust, replaced into unit. Kept bluescreening on 'C000021A fatal system error'. Went through the usual troubleshooting;
Reseated Graphics card
Reseated Memory
Reseated cables in all devices
Tried Last Known Good Configuration/Safe Mode/etc
Booting with Hiren's Boot CD to Mini Windows XP, just shut down before getting into the GUI
Tried to do a repair install with Windows 7 USB, just shuts down when "Loading files" appears
Clear CMOS
Strange.
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Did you reapply the thermal paste after you removed the heatsink?
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A cpu with no/poor thermal paste will shut down in under 20 seconds...