I recently started having problems with my PC freezing, at first it happened very occasionally and I disregarded it as a software flaw, however it became more and more frequent until I reached the point where I felt it would be a good idea to re-install Vista. It had worked fine for around 15 months prior to the problems. My Specs: Intel Core 2 Duo 7400 MSi G33M Motherboard Unbranded RAM (2x 1Gig 800MHz) Radeon X1650 GFX Card Deskstar (is that the IBM brand?) 500 Gig HD (The machine is a Philips HEPC 7501, sold by PC World using the Philips name under licence) I had overclocked it, from 333Mhz FSB (2.67GHz) to 400MHz (3.2GHz). I always used CoreTemp and never saw temperatures above 50C. I pushed this back to standard to see if it would stop the instability - no effect. Tried booting to safe mode - no effect. Tried using different (known good) RAM - no effect Tried using different (known good) HD - no effect Tried clearing CMOS - no effect Tried using different (known good) PSU - got a "crack" noise on first power up, then it powered off, then powered on fine and then crashed as previous - no effect Tried using different power supply socket / surge protector - no effect Basically, it seems to be either the mobo, CPU, or GFX card. I can't test the GFX card as it does not have on board GFX, and I don't have another PCI-E card to use. As mentioned above, I tried to re-install, both XP and Vista, but the machine hangs even when running the installer from CD. The only error codes I managed to retrieve were from when I was running Vista: Product Windows Problem Shut down unexpectedly Date 08/08/2008 17:28 Status Not Reported Problem signature Problem Event Name: BlueScreen OS Version: 6.0.6002.2.2.0.768.3 Locale ID: 2057 Files that help describe the problem (some files may no longer be available) Mini080808-03.dmp sysdata.xml Version.txt Extra information about the problem BCCode: 124 BCP1: 00000000 BCP2: 864A5028 BCP3: B2000040 BCP4: 00000800 OS Version: 6_0_6002 Service Pack: 2_0 Product: 768_1 I wouldn't mind upgrading the CPU or GFX card, but want to know if anyone can advise what is most likely to be the issue? If it's likely the mobo - then my GFX/CPU upgrade will have to wait! I cannot interogate any of the dump files as I tried one last re-install and it always crashes during install now, so I am stuck with nothing. I am loathe to take it in to PC World (where I bought it) as they charge through the nose for this sort of thing, and I have built and repaired many PC's in my time. Any advise appreciated as always.