Hello all. I have a desktop computer that has been running well for the last year or so, although it is an older system. Recently, I changed out the hard drive, upgrading to a larger one. After that, the computer would not turn on at all. I took out the CMOS battery for an hour. The computer would then boot. However, it would restart at random intervals. Sometimes it would boot to install windows before restarting, sometimes it would only boot to the screen prompting Del for bios options. What could be wrong? If you need to know any specifications, I have them handy. Thanks in advance.