my HP d530 sff (P2.66G, 512 ram) freezes occasionally with a strange blocked screen pattern - like psychedelic colored chessboard squares on a blue background. The squares shimmer a little (impying some procesing?) but the system is totally unrersponsive. The fault appears randomly, and does not appear related to how long the machine has been run, nor its current task (as far as I can tell).
It runs xp pro. I've reinstalled xp on a different HDD and get the same, making me think its not software/drivers. I've upgraded the BIOS, run memtest 86+ and prime 95 for hours and some Inquisator and Ultimate Boot CD hardware tests. They are all fine, making me think the basic hardware is OK. I considered the onboard video but I can play movies over a network which is pretty intensive.. With the lid off nothing in the box gets too hot to touch tho some chips and caps must be near 60 degrees celcius. CPU heatsink fine to touch.
It would be easy to give up and say its a wierd motherboard fault, but before I do any ideas? The software keyed to the machine has more value than the box so I'd rather not throw it away.
Thanks for your ideas, Mike