I've built a barebones computer and have run into a problem: it will turn on, but not post. The fans will spin, LEDs turn on, the optical drive opens/closes, and the HDD spins. The PSU is set to 115V. I've removed extraneous parts one by one and tested it, which didn't seem to help at all. I've swapped out displays, power cords and VGA cords with no luck. Parts are as listed:
AMD Phenom X3 8400 2.1Ghz AM2+ CPU
AMD 740G Socket AM2+ Motherboard
450W PSU (came with ATX mid-T case)
Seagate 1TB SATA HDD
Crucial 2048MB DDR2 RAM
Cooler Master AM2 95W CPU fan
LG 22X DVDRW SATA optical drive
I've tried resetting the CMOS but with no luck. Any help would be appreciated, and I'll check in frequently to respond.
EDIT: I did use thermal paste on the CPU/fan as directed in the instructions that came with the CPU, and I followed all instructions that came with the mobo to the tee.