Hi, Hope someone can help with this question. Is it possible for a dodgy CPU to fry a motherboard, the reason I ask Is that I swapped a CPU in a test board & it didn’t work, so I put the old one back in, but that didn’t work either & now the board won’t boot at all. I realise that it might just be coincidental that the board failed at that time & it’s also possible that static caused the fault but it seems like the CPU is most likely responsible. Any help would be very much appreciated. Regards CDH

I've never heard of a CPU taking out a board. Did you install a HSF with a dab of thermal paste when you swapped the CPUs back & forth? And which make/model CPUs are you asking about? Could be coincidence, could be that the board didn't fail at all. Power supply? Did you double check all your connections? "If my answers frighten you then you should cease asking scary questions" - Jules Winnfield (Samuel L. Jackson) in Pulp Fiction

Thanks for the quick reply jam I always install an HSF, I once lost a CPU because I didn’t bother with a fan.I only had the board running to check something in the BIOS but it was time enough to kill an expensive CPU, so a lesson learned. No thermal paste but I never use TP when messing around with MoBo’s only if I’m fiished with a PC. I had a Duron 1200 on my board & I replaced it with a Duron 700 just to see if it worked.It didn’t so I put the 1200 back - no post, no beep, no boot. I checked all the obvious things but still nothing. The machine is one of my test bed PC’s which I use all the time & I’ve replaced the bad MoBo with one exactly the same & it’s fine so I can only assume it was the Duron 700 which caused the problem just don’t know how or why. Regards, CDH CDH