I have a homebuilt (2005) desktop with a 450 Watt PS, Intel D875PBZ MB, Intel 2,6 Ghz Processor. Originally I installed two 512 meg Kingston chips for a total of 1 Gig. Shortly before Christmas my screen would go blank and stop sending any signals to the monitor. Samsung SynchMaster 2232 BW. I assumed (bad me) that it was a problem with overworking the video card. During the troubleshooting process I found the cooling fan on the video card to be locked up. I replaced the video card with a HIS Radeon HD 3650 512 meg card. Shortly thereafter, it locked up again, but on the reboot, I got a message of an 'memory error' (timing has been reset) and required an F4 tour of CMOS. Great, now I can upgrade to a pair of 1Gig memory chips. Again, Kingston DDR from Crucial. After a month of pure bliss..... POOF same thing. I am using the recommended memory both from Crucial and Intel's manual that came with the MB. I haven't changed any setting in CMOS, much less any alterations to the system or memory timing. Any ideas will be greatly appreciated.