Summary(/Cliffs): This all started about four days ago, I was getting 2-3 BSOD's a day, usually the IRQ_DRIVER_NOT_EQUAL or BAD_POOL_CALLER and whatever. Can't get into either OS for more than 2 minutes without a BSOD or kernel panic. Memory tested fine, pulled all hardware and issue remains. Mobo/cpu shot? Hardware: I built this computer about 16 months ago and it's been perfect until now. Current hardware: ASRock P4V88 motherboard, P4 3.2GHz, 2x512MB PC3200 DDR RAM, nVidia GeForce FX5500 AGP, nVidia GeForce 4 MX400? PCI, generic PCI sound card, SATA 200GB HD, IDE 400GB HD, generic DVD burner. I thought it might have been a power supply issue, so I bought a new 600W PSU. Of course, no change. Diagnose: The system would no longer POST, so I took one memory stick out and I can at least get into the BIOS and attempt to boot into either Windows or Linux. I ran memtest86 on both sticks individually and they both check out fine. As long as I only have one stick in, it'll POST. However, once it tries to boot into Windows or Linux, it either dies right away or I get a BSOD/kernel panic. By dying I mean it'll just lock up, or I get a different BSOD/kp each time. Every 1 in 10 tries I'll at least get the whole OS loaded before this happens. As well, I can't boot off of any CD's without it dying on me. BSOD's in Windows setup and hard lockups with Linux cd's. I took out the sound card and PCI video card, same issues. Put them back in, took out AGP card, same issues. Put it back in, unplugged both HD's, cdrom, and floppy. Same issues. Assumptions: Memory is fine unless both sticks are in, and my power supply is brand new so that shouldn't be the issue. Pulled out everything I could, issue is still there so all of that should be fine. All that I can really guess is it's either the motherboard or processor. Any ideas?