I've got an older 2008, Mac Pro with an OWC SDD as my main drive running the latest version of Snow Leopard.
In the last several months I've been experiencing problems where the system will shut down (screen says it has gone to sleep and I cannot wake it) but the tiny white power light on the front of the computer stays "on".
The only way I have been able to get it to turn back on, is to power down holding the power button in, until the white light goes off. When i power back on, some times it will boot to the desktop, and other times, it will just get to the grey Apple logo and instantly go into sleep/ hibernation, etc (I'm not sure what it's doing).
Things I've tried to resolve the problem:
- Permissions repair (no problem) - using Drive Genius
- Disk repair (no problem) - using Drive Genius
- Uninstalled (or not installed) any of my typical post-reformat software
- Replaced RAM
- Replaced RAM riser
- Reset PRAM, (and other similarly suggested fixes)
- Disconnected everything except keyboard, mouse and monitor
At one point I went through all of my ram, tested it all and all passed using software similar to those recommended elsewhere in other Apple discussions
I once removed some ram from the bottom riser (hunting and pecking here) and this allowed me to boot. (I have had as much as 16GB of Apple approved ram across each riser, inserted into each dim slot as recommended by Apple.
Could this be a drive problem? I am using an OWC3gb SSD
Could it be a power supply problem?
The system is clean, and dust free. The system runs cool (within the recommened guidelines)
Is there something I might try that I haven't mentioned here?
Thank you so much.