I'm trying to hold out for one more version of the iMac, but my G5 has taken a turn for the worse. any suggestions for a self repair would be appreciated. Symptoms (all are sporadic): -Shut down when trying to wake from sleep -Failure to boot, makes it to the gray screen with the apple icon and spinner -poor performance (partially alleviated at this point) -issues started after a move (could have been jostled) -failure to boot off TechTool Deluxe DVD -Popping sound on shut down. -Starts up eventually, by the 5th attempt. Mac Details: Nov 2004 iMac G5, non-iSight, PowerMac8,1, 1.8ghz, 2GB RAM, 600mhz bus, Leopard 10.5.8, Western Digital 500gb NEW Green HD. On Nov 2005 Logic Board and Power Supply failed and were replaced under Apple Care. thank you AppleCare. Attempted Repairs: Ran TechTool Deluxe and Apple Hardware tests, both came up clean. Repaired Permissions via disk utility and off original OS CD w/ Apple Tests Downloaded "SMART Utility" from apple downloads. Diagnosis was that about 11 sectors were 'caution, near failure' Replaced Hard Drive with new WD 500g (performance issue improved) Reset SMU by plugging in while holding Power Button Reset PRAM on boot up Checked logicboard LED's per Apple's checklist for diagnosing failure to power up. All LEDs checked out fine (LED 1 on, LED 2 stays on),and starting the computer off the onboard button worked everytime. Reset SMU with the small button Visual Check of Capacitors - appear OK. I have not disassembled the Power Supply to check the Caps there. The serial number of both the new and the old Logic Board fall within the numbers that received the bad Caps; however the current logic board is at the high end of those, and therefore may not be effected per the documentation. My next step is to take it in, but if this is for another large replacement, I'll probably just buy the current iMac instead of waiting. However... as long as I don't power down or sleep its not much of an issue.