BSOD and startup issues

I've been experiencing BSODs, random crashes, and trouble with startup on my HP Pavilion p6620f.

The computer specs are:
Motherboard: N-Alvorix-RS880-uATX
CPU: AMD Phenom II X4 820
Integrated Graphics: ATI Radeon 4200 (disabled)
Graphics Card: Nvidia GTS 240
PSU: Corsair 500W (upgraded)
OS: Windows 7 Home Premium 64 bit

The computer is about a year old, and the card was added along with a PSU upgrade shortly after I got it. The BSOD has been happening occasionally for a while, but has become very common recently, along with the new startup issues. The crashes do not seem to occur at any particular time (often the computer is idle when they happen, and I have not had crashes while gaming). When starting the computer it sometimes turns on the power light, but nothing shows on the screen, and sometimes the hp screen (before windows loads) comes up, but freezes.

I've looked through the crash dumps, and the common one seems to be x124 caused by hal.dll. From what I've heard this usually indicates a hardware problem, but after reading this I'm wondering why I'm getting hal.dll errors at all.

Anyway, so far I've tried:
reinstalling drivers for the graphics card
running windows system repair
running bootrec /fixboot and bootrec /fixmbr
opening the case, cleaning dust, and reseating memory and graphics card
GPU stress test (Furmark) didn't see any artifacts, and no crash, but I stopped the test at 100C, and it was still climbing (the cooling on the card is terrible)
memtest86+ through about 13 passes, no errors
windows error-checking on the HD, almost done but no problems so far (93% through free space)

If you have any ideas, I'd greatly appreciate the help, thanks!

crash dump example:
Dump File : 091611-23696-01.dmp
Crash Time : 9/16/2011 7:39:21 PM
Bug Check String :
Bug Check Code : 0x00000124
Parameter 1 : 00000000`00000000
Parameter 2 : fffffa80`06b598f8
Parameter 3 : 00000000`00000000
Parameter 4 : 00000000`00000000
Caused By Driver : hal.dll
Caused By Address : hal.dll+f768
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+4b16cc
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\091611-23696-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 262,144
2 answers Last reply
More about bsod startup issues
  1. I would try a new power supply if you have one to hand.
  2. The only power supply I had around to try was the original one. With the original power supply and no graphics card it seemed stable. What I noticed in switching to the old power supply, however, is that the old supply had a 20 pin connector, while the motherboard has a 24 pin. When I replaced the ps, I plugged in all 24 of the new supply. Its now running on the new (Corsair) power supply with 20 pins, and seems to be stable. Thanks for pointing me in the right direction. :D
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