I'd like to start from the beginning. Let me get this straight. You bought a new 120GIG HDD which you intended to install. Q: Is it a Serial ATA HDD or an IDE HDD? Q: When you said, " at first i had some trouble getting my pc to boot but cleared the cmos and started up fine." Did you mean you were trying to get it to boot to the new disk or the older one? I presume the old one.
Now, I think that clearing your CMOS was the wrong move that this point, seeing as the only hardware change you made was adding a new harddrive. You should have started with the HDD or HDD's, checking master/slave jumpers or molexes or config in BIOS of boot sequences... ETC. But, now you took (1) issue and erased all of your BIOS settings back to default. Which you might have been able to go into the BIOS and find the problem.
Then... LOL you fried the CPU because you got a fan wire stuck in the FAN... LOL...
Dude, next time bring yuor PC to a professional.