Dell Dimensions E521, Please Help!!!!

After a split second power failure I decided to call it a night. Next morning I tried turning my "2nd" computer on. The screen starts off as if windows is loading till about half way, then the "Systems Info" page comes up. Instructions says to hit "esc" then "exit". I do this and windows continues to load, when it gets to where you should see the desktop, the "Systems Info" page appears again. I have unplugged the power cord and plugged it into another outlet. Computer boots up fine. Once I have either done an update where rebooting applies or shut down myself I end up with the same problem. I am not able to unplug from one outlet to another right away and boot up. It is always, I have to wait a while or till the next day and change the electric outlet i'm using before computer will boot up properly. I can tell when the problem will occur, I hear several quick ticking noises and then the "System Info" page appears. Using the same monitor. I have 2 computers hooked up together via router/dsl. The main computer booted up without any problems the same night. My problem is only with the 2nd computer. They were both plugged into the same outlet. I was told by a member of this site to do a system restore, which I did. That worked for about 4 days and then the same original problem returned. I have also tried hitting the F8 and doing a computer repair and that did not do anything. I have changed the power cord to the tower. I was able to boot up once and then tried rebooting and same problem returned. I am at a total loss. Please help!!!!