Can't boot on hard drive or CD/DVD - grey/gray screen of death
A few weeks ago my PowerPC G5 Dual Processor Early 2005 running Leopard OS X froze while the screen saver was running. I hard-powered-off the computer --> held down power button for ~10 seconds. When I tried to start up again, I got the "gray/grey screen of death" with the Apple logo. The screen hung there and then fans starting ramping up to full speed with no sign off boot up. I know others have posted similar issues, but I wanted to start a new thread.
PowerPC G5 Dual 2.5 Hz (?) Processors
4 Gb memory (recently upgraded form 2 to 4) ***
Bought in early 2005 (I think)
Here's a summary of what I've tried:
DOES NOT WORK
- booting up holding down C (for drive) --> straight to kill screen
- booting up from original discs for G5 (from both C mode and Option mode)
- booting up from 10.5 Leopard disc (from both C mode and Option mode)
- booting up holding down Option-Comman-P-R --> straight to kill screen
- connecting to secondary computer using target mode (holding down T) - I can see both of my hard drives
- booting up holding down Option - I can select either my main drive (secondary is not present there but there is no OS on it) or CD/DVD in slot
- booting from Apple Hardware Test (AHT) disk from Option menu
-- I ran disk checks, had errors. I ran Disk Warrior from secondary computer in target mode and repaired the drive, running the AHT test again shows no errors
- ran disk repair from secondary computer to fix errors (using disk utility and disc warrior)
OTHER THINGS I'VE DONE
- replaced backup battery on motherboard that was weak at only ~70 mV with fresher battery at ~3.6V
- held down PMU (not SMU) reset button for 30 seconds
- (main fans were cleaned a few weeks before issue)
- two weeks before issue I installed more memory (from 2 Gb to 4 Gb with two new 1 Gb cards)
- backed up data - so I can delete drives if needed
- I'm concerned that under CPU it shows 158950.77 GHz - shouldn't it be showing two CPU?
- the drives look healthy when looking at them in target mode
- issue is occurring between power up and drive selection (since CD/DVD is also not viewable)
- maybe the new memory caused local over heating to the motherboard?
- I may be able to replace the heat sink, but the spare computer I have access to has different looking hardware. It's probably a different model of the G5. My computer has one metal case cover and the extra one has a split case cover.
- I need to back up secondary drive fully first
- pull out new memory sticks
- pull out all memory except originals
- pull out secondary drive
- buy external case for drives and cry about how no one will buy my dead desktop
Because this is a long description, I will post updates in the comments and a final comment here: