Allright, here I go. Since I've spent a long time now trying to figure this out by myself and searching the web for answers but I couldnt find any, I turn to this forum with hopes of anybody else who had the same problem can help me. My Computer: OS: Microsoft Windows XP Professional Service Pack 2 CPU: Intel Pentium 4, 3000 MHz Motherboard: Asus P4P800 Deluxe RAM: 1.5 Gb Graphic Card: NVIDIA GeForce 6600 GT (256 MB) (AGP) My Problem: If I run my computer at the standard specifications (see above) I keep geting the famous BSOD's or reboots every now and then. It actually has gotten worse over time and I cant even get into windows anymore. Safe mode works like a charm and is no problem. Now you might think that I have bad drivers but that is not the case since I actually updated my drivers. (Graphic card, sound card, network card). I have tried to put my RAM sticks in there 1 by 1 with no good luck, I keep getting BSOD's or reboots. I tried reinstalling windows, no luck here either, I actually got BSOD once I installed. Eventually I managed to install windows without getting any BSOD. I've tried changing my PSU and my graphic card, same result. My "Solution": Ok, heres what I can do to run my computer. My computer runs perfect in safe mode, OR if i run it at 2000 MHz. Not long ago I could even run it at 2500 MHz. Now this got me thinking that it could be a CPU heat problem so I went and bought a new CPU fan. Installed it and tried to run my cpu at default specs. Bam, BSOD. My temp @ 2000 MHz idle: 34 C My temp @ 2500 MHz idle: 38 C My temp @ 3000 MHz idle: 41 C (Temps monitored in bios, Forgot to say that I can sit in bios without the computer restarting @ 3000 MHz) My head is getting red and im loosing hair from all the scratching. Is it my CPU who is failing or is it my motherboard? Before all this started I had VERY high temp on my cpu (70 C while playing games, 50 C Idle) and was about to get a new cpu fan but I guess I was to late. But what Is bothering me is that I can run safe mode with no problems at 3000 MHz. I really need help with this one, I have my 20 cents on the cpu but It could also be the motherboard. Im all out of ideas! If theres anything you wanna know, just ask. Many thanks Moderator Edit: Thread title changed. Please use descriptive titles. Thank you.