Not powering up. Dead logic or PSU?

Hi people,
I've been given a G5 DP and it doesn't power up. the power LED works only when you press it, turns off once you let it go and the fans kick for a split second then nothing. I open the case to inspect what hardware is installed. All the usual components and only 1 x 512mb stick. is it designed to run single memory or in pairs? so not sure if that would stop it booting or if the problem lies with the power supply or worse.. logic board.
Thanks for your time

Hello,
Also Check the PRAM Battery. Try starting up the G5 without the battery in place. Also, when installing RAM, it must be installed in exact matching sets from the center outward. (Slots are numbered from top to bottom: 4,3,2,1,1,2,3,4) Install RAM starting in slots 1 and 1 then 2 and 2 then 3 and 3 then 4 and 4. Also try zapping the PMU. (Small little button on the logic board behind fan assembly)
japamac wrote:
There should be two DIMMs (RAM must be installed in pairs) and this could be a cause for not starting.
If the Mac has no RAM you should see fans spinning and everything operating but the Power LED should begin blinking at you saying theres no RAM in it. It will be like +blink blink pause, blink blink pause+ etc.
Regards.
—Matthew—

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