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Power light blinks twice, fans high

I know this type of question has been asked here but id like to explain my issue.

Power Mac G5 has been sitting on the shelf of a business for at least 3-4 years with no use or ever being powered up. I get it today and power it up but immediately the fans run high and theres no video on the screen. The power light blinks white twice constantly.

I took out all of the ram - same exact thing (and no beeps even).

I take out all the ram and pram battery - no change.

I held the pmu button - no change.

What am I probably looking at? May just need a new pram battery since it was sitting dormant for so long? logic board? psu?

any help is appreciated.

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I got it up and running! Radioshack had the PRAM battery I needed - decided to replace it just because it was old. I installed 5G ram in pairs (which was the main problem to begin with) and I was able to install my OS after finding an install disc and buring it to DL DVD. Alls well. thank you!

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The fans kick into high by default when a temp sensor fails to keep from cooking the CPU or other components like a GPU.

You have damaged RAM, and possibly other problems.

• 2 Flashes: No RAM is installed or detected (could be bad RAM).

• 3 Flashes: Incompatible RAM types are installed.

• 4 Flashes: No RAM banks passed memory testing.

• 5 Flashes: No good boot images are detected in the boot ROM (and/or there is a bad

sys config block).

• 6 Flashes: The processor is not usable.

Replacing the PRAM battery is good idea - the battery is recharged when the computer is plugged in, but the life of a battery is at most 5 years. PRAM Information includes:

  • Speaker volume
  • Screen resolution
  • Startup disk selection
  • Recent kernel panic information, if any

If you experience issues related to these functions, you may need to reset the NVRAM or PRAM.

Resetting the SMC or PRAM is not a "fix" it should only be done as part of a troubleshooting process.

If this answer is acceptable please remember to return and mark it.

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Thanks for your reply. I removed all the ram from the powermac and shouldn't the motherboard beep at me like other motherboards do? I haven't worked on powermacs in the past so I'm not sure if its special and won't beep with no ram.

Also, I tried a working module of pc3200 ram in each of the 8 slots, one slot at a time, and it still does the same thing - fans immediately run high and no video on monitor. Think my Motherboard is bad?

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ok i never knew about the installing RAM in pairs on a G5 (http://manuals.info.apple.com/MANUALS/0/...). Never worked with them before but I installed 2 sticks of ram in each slot 1 and i got the apple chime and no blinking lights! just a solid light!!! amazing. but the fans still run high and no video output. still trying to boot to OSX install disc.

The fans which run high are the 2 fans between the HDD and the disc drive.

could THIS then be the motherboard? video card?

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Anything is possible. No video could be a blown video card…are there fans on the video card? Not knowing why it was parked that might have been the original problem. You could have a bad optical drive…or HD you almost have to put the components in known "good" machines or cases and try them.

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