Having issues with my comp PLEASE HELP

[Entropy1982]

So my northbridge chipset fan broke so i had to replace it... the company sent me a new one and i replaced it (had to fight w the mobo and stuff a bit in the process cuz i didn't want to unplug anthing). plugged everything in finally and turned on the comp... all the fans worked fine computer started but then it didnt detect a single hard drive (none of my 3 SATA drives) but it did detect my dvd drive (ide).... what could i possibly have unplugged?

[biohead]

clear CMOS. reboot a few times. harddrives should be detected.

[Entropy1982]

clear CMOS. reboot a few times. harddrives should be detected.
ok i found out what the main problem was i think... when i was putting the mobo back in i took out the jumper on the cmos pins (it should be on the upper 2 pins).... so i attached it back to the 2 cmos pins and it didnt work... so should i put it on the 2 lower ones first (to reboot cmos) ... shut off the computer.... then put it on the 2 upper ones (normal mode) and reboot a few times?

thanks

edit: ok i did exactly what i said up top and it's still not recognizing the hdds :( any ideas?