Hi all. I have bought a second hand motherboard off the internet to replace my old Asus p4s133. The new motherboard is an ECS 661fx-m. The problem is that on the old asus board, i was able to overclock the same cpu to 2.3Ghz with no problems at all. But with this motherboard, the moment i try and overclock it to even 2.1ghz the system will not start most of the time. (fans spin, lights come on, screen doesnt come on and windows doesnt load). But when i do get it working, the system boots into windows and runs perfectly fine. Even in games it is completely stable at 2.1ghz. Everytime i turn my computer off though, i have to turn it on and off at least 5 times to get it working again. Why would this be happening? I dont think it has anything to do with voltage as when in windows it performs fine. Maybe a damaged cpu? I really have no idea. I find it really strange how this is happening. My system specs are as follows: CPU: Intel Pentium 4 Northwood 1.6Ghz (Overclocked) RAM: Adata 1GB DDR-400 Mobo: ECS 661FX-M Video Card: Sparkle Nvidia GeForce 6600GT 128MB AGP Any help would be much appreciated Cheers, Nissanman edit: The motherboard has no bulged or dodgy capacitors. So its not a capacitor issue.