[cavok]

Hi,

I bought on eBay a G3 yosemite motherboard (Blue & White Power Macintosh G3/300), I also have PC100 unbuffered non-ecc RAM and a standard ATX PC power supply.

When I hit the power button on the board, some green leds flash and nothing more happens. I tried to change power supply and ram but still nothing.

Am I missing anything? I was not able to find any troubleshooting on such motherboard.

Please, give me a hint. Thank you.
Domenico

[cavok]

Ok, I found something in japanese.. Power Macintosh G3 Line (B&W) Tune-Up 7

Removing the white cable from the ATX connector the motherboard powers up!

Thanks anyway
Domenico

[cavok]

sorry for the self-reply...

Better explanation of the conversion, in english... Blue G3 power ATX supply conversion

Other info from Apple... Power Macintosh G3 (Blue and White) and Power Mac G4: Power Supply Voltage Test

cheers
Domenico

ps: google "g3 power supply"

[Sherman Homan]

cavok,
I am so glad we could be of help to you!

[angelmb]

My Yosemite used to have such behavior, it turned out than one RAM slot was damaged. Not 100% sure if it was the culprit but I can't recall it failing again since I removde the RAM module (which was fine) attached to the aforementioned RAM slot, any RAM module attached to such RAM slot just didn't work. I had tried it before with the CUDA switch, reseting PRAM and so on… to no avail.