Slow Computer with High CPU Usage
I just moved my motherboard, RAM, CPU, and graphics card to a new case with a new power supply. There is an old hard drive in, but it has been freshly formatted and had Windows XP Home installed. It however is extremely slow even though it has pretty decent parts. Booting up takes forever even before the OS comes up and then the OS takes forever to come up and is ridiculously slow. The CPU usage is 100% when first boot up and then decreases to 70%. Generally it runs at 0% or 1% when it's just sitting there at the desktop.
Since it is slow before the OS comes up and goes through POST and BIOS slowly even when no drive is plugged in, I don't think the hard drive is the problem. I don't think there could be a virus in the BIOS or anything since these parts all worked in the other case with the other hard drive. The RAM doesn't seem to be the problem since I tried other RAM which I know is good and it was still slow. I thought that maybe the CPU wasn't getting enough power, so I tried a different power supply and nothing changed. I reset the CMOS as well.
Here are the parts that I have in right now. I'm going to be using some other stuff as well, but for the purpose of troubleshooting, I've removed everything else.
2.21 GHz AMD Athlon 64 X2 Dual Core Processor 4400+
2x512 Mushkin Advanced Blue Series
2x1024 Mushkin Advanced Blue Series
EVGA GeForce 7800 GT
Western Digital 160 GB
PC Power and Cooling 500 W