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MacPro chimes on startup, does not boot and then powers down

It is a 2009 tower with a lot of upgrades. After the chime the displays never turn on. After a few minutes the system powers down. Have tried:

A different video card

zap P-ram


SMU reset

still no go.

Could it be memory?

Thanks for any help!

Answer this question I have this problem too

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Does the mac display anything? Apple logo?

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David Stence will be eternally grateful.
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