Hi all, A couple of days ago I got a PowerMac G5 dp 1.8 identical to the one I already had, but this one is showing strange behaviour. When you turn it on, it makes very strange squeeky and beeping noises. Not beeping as in unsuccessful post, but beeping like a phone charger does when you don't plug your phone in it. It posts normally and boots into OS X. After bootup, the noises stop and only reoccur sometimes, completely random. Now sometimes, when I start it it turns on and chimes, but shows a dark grey screen and does nothing. Most of the time it boots normally, but it doesn't run as fast as my other identical G5. I swapped the RAM from my disassembled G5 and put it into this one, no change. Fans all operate about normally, but sometimes they randomly ramp up to full speed and than go back to normal again. I've had to randomly reset NVRAM twice because it didn't want to turn on. It doesn't exactly seem to get worse, but the machine for sure isn't running well. Hardware I've checked: Hard drive RAM Graphics Card All fans. But I can't find what the issue is, and neither can I find the source of the noises. I'll record them tomorrow so you can hear them too. Does anybody know where I should start to look?