I went to turn on my iMac G5 this morning, it came up to the apple logo and the spinning cog, but then it was taking a VERY long time to boot into the OS so I just said "fair enough." and waited longer, but then the fans came on at full blast, and I became really worried, the iMac wasn't hot or anything so I decided to wait through it, but then the iMac restarted and did the same thing, like a boot loop. I've tried everything, reseting PMU and all the other things, but still no joy it keeps doing the same thing. On a side note, when I hold the power button down it makes a very loud beep noise, does this indicate RAM problems? 