Comp restarts at startup

[darkeen]

Ok so for the past few days or so (it would freeze everyonce and again before) I have been having the problem of my comp (see sig) randomly restarting on me and tonight I decided to try and fix it. At first I though I had a bad stick of ram so I ram memtest and let it go for 1 pass, no errors. Second I thought it might have been due to a thrid hard drive I recently added so I proceded to uplug it, that for some reason or another caused my computer to restart whenever it got to the windows logon screen. So confused as I was I plugged it back in, now it is restarting at the loading screen. WTF is wrong with my box
Right now I have I have knoppix 4.0 attempting to load on it but it seems that it is just hanging at the loading screen.

System specs in sig aside from the hard drives. I have 1x 120GB seagate (boot drive) 1x 200GB SATA seagate and 1X 200GB IDE seagate. All are the 7200.7 series. I will be online via laptop for a while so any questions you have should be answered quickly.

Edit:
HOORAY SYSTEM RESTORE!

 

[cosmo3]

You didn't say if you are oveerclocking but if you are back it off a bit and see what happens. I just installed a new KN8 Ultra motherboard and Opteron 148 cpu and had some cold boot problems and when I intalled a new power supply all problems went away. I had a 400W Seasonic power supply and now I have the Tagan U22 480 and all is well. I really like the Tagan Power supply as it is quiet and has all the hookups you would ever need. Many power supplies do not put out like they say so be careful with cheap brands.