Firstly, thanks for taking the time to read my post. I have a Dual 1Ghz G4 mirror Drive Door PowerPC at home. I had upgraded the ram to 2gb (same sticks as the original) and added an matched (same as original) 80GB drive as a secondary, It worked fine for about 6 months at home then it started hanging every so often randomly and you had to do a hard reboot (holding the power button) however it would not boot back up. Gets to the Apple logo screen then after a few mins to a blank blue screen and no further, I had to boot from a disk and run disc repair on that drive where it reported invalid HFS header (or volume, cant quite remember) and it manages to repair it every time. I presumed it the drive was on its way out so replaced it with 40GB IDE drive from another machine which I know works, copied the image from the old drive to the new drive and it booted fine, worked for a day then the same thing started happening again, its very random, sometimes its fine for hours and it will just freeze up. So if its not a drive issue do you have any ideas what else it could be? Im hoping its not a duff IDE controller as if thats the case then Its for the bin which would be a shame as its a cracking wee computer. Appreciate any advice you can offer.