Currently Being ModeratedMay 23, 2012 5:12 PM (in response to guitar guy)
Sounds like the machine doesn't get to logic; processor function.
Start with the basics.
1- Reset the PRAM
2-Reset the SMU
3-Inspect for coolant leaks
4-Reseat the RAM
5-Reseat the graphics card
Of note: any diagnostic LEDs lit?
Currently Being ModeratedMay 23, 2012 5:35 PM (in response to japamac)
Step #1 fixed the problem.
All i did was reset the PRAM, and everything suddenly worked.
I forgot how relevant resetting PRAM still is....
Currently Being ModeratedMay 23, 2012 5:41 PM (in response to guitar guy)
I'm glad that it was easy.
This likely indicates that it is past time to replace the PRAM battery on your logic board.
Might pick up a new one.
Currently Being ModeratedMay 23, 2012 6:16 PM (in response to japamac)
is that easy to do?
I'll look it up online..... thanks again!
Currently Being ModeratedMay 23, 2012 6:36 PM (in response to guitar guy)
Look for the button battery on the board. note which side is up and replace it with one of these:
Currently Being ModeratedJul 5, 2012 6:25 PM (in response to japamac)
hey japamac, it has happened again, and now, the PRAM won't reset. The fans go full speed, monitor doesn't turn on, and i have to force shut down. When I re-boot, the HD sounds as if it just waking up from sleep, not as if it's being re-booted. The Apple tone never sounds, and again, no monitor, and after 30 secs, the fans go full speed again. Anyway, i guess it's time to look at the PRAM battery........?
Currently Being ModeratedJul 6, 2012 2:47 AM (in response to guitar guy)
i guess it's time to look at the PRAM battery........?
Start there so as to eliminate the source of many evil gremlins......
You can reset the logic board by shutting down and disconnecting power to the tower (and monitor) for 15 minutes.
Reconnect power and try starting.
Currently Being ModeratedJul 11, 2012 12:06 PM (in response to japamac)
...so I reset the logic board and it didn't help, but hours later, it booted up and its been fine for 4 days now. Of course, the computer has been on that long. We haven't shut it down yet.
Currently Being ModeratedJan 28, 2013 9:47 PM (in response to japamac)
hmm...its doing it again. And the pram battery is only 6 months old.
I tried all your diagnostic steps (except for the battery) and nothing helped.
Currently Being ModeratedJan 29, 2013 2:33 AM (in response to guitar guy)
Boot to the OS X install disc (if possible).
In the window after selecting the language, from the Menu Bar/Utilities select Disk Utility.
Run "Repair Disk" on your startup drive.
Make note of any errors (if present).
If errors are repaired, run the repair again, then restart normally.
If the machine won't boot to the OS install disc, one would want tom try the AHT (Apple Hardware Test) from the original software install discs. Running the full battery of tests (extended) would be desirable.
Currently Being ModeratedJan 29, 2013 4:20 AM (in response to japamac)
Thanks jap but I have no monitor. The monitor doesn't turn on
Currently Being ModeratedJan 29, 2013 6:08 AM (in response to guitar guy)
The monitor doesn't turn on
Booting to the OS X Install disc?
How about the AHT? Do you have it?
Can you borrow a DVI monitor? That can help rule out the adapter....
Currently Being ModeratedFeb 1, 2013 9:29 AM (in response to japamac)
jap, i can't get thge DVD drive door open. So i can't boot from the install disk. I boot the computer up and hold the eject button down on the keyboard, but nothing happens.
I also can't zap the PRAM like I did the first time i had this problem, and that had temporarily fixed the issue.
But now, I hold down command+option+P+R, and nothing happens. No "chime" sound (is that what we call it?). The fans go full speed after 30 seconds, and the monitor doesn't turn on.
I also can't boot into open firmware.
So the keyboard seems unresponsive.
I reset the SMU.
Is there a way to manually get that DVD drive door open?
Not sure if I can borrow a DVI monitor. I'll ask around....
I don't have AHT, but without being able to open the drive door, not sure what i would do...
Currently Being ModeratedFeb 1, 2013 4:06 PM (in response to guitar guy)
guit, the drive door can be opened during startup by holding a mouse click.
Manually, pull the tower drive door cover open using a peice of tape and look for a smal hole to the bottom right of the tray. Using a straightened paper clip, insert the wire into the hole and once contacting the opening mechanism inside, push.
Once you have pushed the tray out a bit,,pull it open with your fingers.