Mac Pro 2008 flashing light HELP


hello,

shut down mac pro 3.1 in night. today powered , did not boot. right after powering up, power light flashes continuously until hold power button 3 seconds , power down. does. no video signal @ all, hence display remains in standby , not come up. fans working normally, including 1 of video card. hdds spin up. configuration default one, including ati 2600 video card. tried:

- checking basic connections -- hdds, raiser cards, reinstalling video card,
- removing 2 additional hdds,
- removing 1 of raiser cards or exchanging,
- changed mainboard battery fresh cr2032,

nothing.

it's installed 8x kingston kta-mp800k2/4g = 16gb total. there no red lights on raiser cards indicating malfunction of memory modules (i've had few bad modules before , not cause issue).

please advise. have important information on machine, , it's work machine need bring working condition soon.
 

i resolved issue.

turned out malfunction of pair of ram modules. strange mac behaved in such way instead of turning raiser card's red lights on , booting, considering fact these modules not among primary ones on raiser cards.
 


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