PC wont boot after CPU upgrade Tags: CPUs Pentium Celeron Last response: November 21, 2009 4:39 PM in CPUs Share Anonymous a b à CPUs November 21, 2009 11:23:04 AM Hi, Just replaced my Celeron CPU with a Pentium D 945(3.4GHz,4MB)fsb 800 from an older PC. The pentium is working fine in the older machine. When the upgraded machine boots it gets past the BIOS screen and then switches off, I put the Celeron back into the MOBO, flashed the BIOS with the most recent version and when i put the pentium back in the problem still remains. I`m using a Gigabyte GA-945GCMX-S2 Mother board with 2 gigs of 667 ram and I followed all the MOBO instructions for installing a new CPU from the Manual. Can anybody help as i`m obviously doing something wrong, Dave More about : wont boot cpu upgrade GhislainG a c 113 à CPUs November 21, 2009 4:32:12 PM Are you sure that it doesn't overheat? m 0 l jsc a c 172 à CPUs November 21, 2009 4:37:12 PM Overheating because of improper HSF installation is one possibility. Inadequate power is another. And it is possible that the CPU died in the transplant process. Does the CPU still work in the old computer? m 0 l Can't find your answer ? Ask ! Get the answer ulysses35 a b à CPUs November 21, 2009 4:39:13 PM Heat is a real possibility - but so also is your PSU - Pentium D's use a lot of power, maybe the PUS isnt up to the task post your full specs and someone will be able to point you in the right direction m 0 l Can't find your answer ? Ask ! Publish Related resources After a motherboard and CPU upgrade my PC wont boot Forum PC wont boot after cpu upgrade Forum PC won't boot after mother board & cpu upgrade. Forum SolvedComputer won't boot after motherboard, graphics card, and cpu upgrade. Forum SolvedPC won't boot after installing stock CPU fan Forum SolvedPC wont boot after BIOS upgrade Forum SolvedPc won't boot after cpu change Forum SolvedPC won't boot after RAM upgrade. Now old RAM won't work either. Forum SolvedComputer wont boot after CPU upgrade Forum My computer wont boot up after CPU upgrade Forum Dell optiplex 390 won't boot after cpu upgrade Forum SolvedPC won't boot after new CPU and liquid cooling Forum SolvedComputer Won't Boot After Upgrading CPU Forum SolvedMy PC wont fully boot after a new cpu Forum Laptop won't even boot Windows 8 installation DVD after CPU upgrade Forum SolvedWhat to do if PC won't boot after undervolting CPU in AMD Overdrive? Forum SolvedPC wont boot after BIOS upgrade... help needed urgently! Forum I know many threads but pc won't boot after GPU upgrade Forum Computer won't boot after Motherboard/CPU upgrade Forum Won't boot with gtx570 after CPU Upgrade Forum More resources Read discussions in other CPUs categories AMD Intel Intel i5 Intel i7 Phenom Cooling Performance !