I have a MacPerforma 6200. 7.5 OS, 40 megs RAM, 1.2 gig HD. Just recently I turned it on and received some weird tones. Then the computer crashes and shuts down. Trying to reboot immediately results in an instant crash. After several hours I can get it to completely load. But when I try to run a diagnostic program it gets half way through and then crashes again. The clock appears to be correct. Possible problems could be the internal battery is bad causing the computer to quit. After the CPU runs for a few minutes maybe a circuit opens up and causes the crash. I just don't know what the problem can be. At the present time I'm interested in trying to save what is on the HD. I need as solution to get this computer up and running soon.