I put together a PC with the following components:
Intel BLKDG965SSCK LGA 775 Intel G965 Express Micro ATX Intel Motherboard - OEM
Intel Celeron E3400 Wolfdale 2.6GHz LGA 775 65W Dual-Core Desktop Processor BX80571E3400
Patriot Extreme Performance 4GB (4 x 2GB) DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory
RAIDMAX HYBRID 2 RX-530SS 530W ATX12V V2.2/ EPS12V SLI Ready CrossFire Ready Modular LED Power Supply
Everything seemed normal as I started to install Windows 7, but it seemed to be taking much longer than normal. I let it go overnight until it seemed to just stop running (I later realized it had gone into hibernate and the installer was still in fact running). So I rebooted and this time checked the BIOS. Temperatures seemed to be good, 30 C for the processor. Processor speed was listed at .4 GHz?? I thought I must be confused by the BIOS or something, because that's not possible. I think it is running at .4 GHz, though.
I figured the problem had to be either CPU incompatibility, a faulty CPU (and/or motherboard), or maybe I didn't have all the power cords plugged in the way they should be. Someone on another forum linked a compatibility guide, showing that the processor I purchased was not listed as compatible with the board. Thinking that must be the problem, I ordered a new CPU.
Intel Pentium E6700 Wolfdale 3.2GHz LGA 775 65W Dual-Core Desktop Processor BX80571E6700
Same exact problem. BIOS shows .4 GHz.
The motherboard has spots to plug in case fans, which I did not use. I thought that might be the problem; maybe it's underclocking the CPU because it thinks there are no fans. I plugged in some loose fans I had lying around, though, and it made no difference. CPU .4 GHz.
Today I found a post on this forum that I think that might be the same issue; but I can't say because it's an old post, a different board, and not enough details are provided.
Possibly related forum post (2009):
This leads me to hope it's a BIOS problem and therefore maybe someone here can tell me how to fix it so I don't have to buy a new board.