I have a problem with my good old companion, an iMac 400 Mhz DV/SE. It still had the original 10 GB harddisk inside which has become conspicuously loud lately. So I finally decided to exchange it with a 40 GB Western Digital HDD, which was used for a Windows XP computer before. The operation itself went well, the hard disk was replaced with no problem and is comfortably quiet now.
However, when trying to fire the iMac back up again and inserting the original OS 9 installation disk for formatting the drive/installation it would start to read the disc - but eventually freeze up. It also freezes when using the hardware diagnosis CD I got with the iMac. Whatever I do, it keeps freezing up after a couple of minutes. Interestingly, the time periods between start-up and freeze vary each time.
So my first suggestion was that maybe the RAM became bad for whatever reason, so I tried to start up with only one of the 256 MB Rams and even tried an older 64 MB RAM - but with no success. The results were the same.
I'm lost now. To be honest, I'm a bit afraid it could be the logicboard. :-(
Anyone else has any suggestions? I'm grateful for any advices ..