MP 1,1-5,1 Mac Pro 3.1 power light blinking - no video, no chime

[ddr3fbdimmecc]

Hey Guys!

I guess I need your help.
I bought a 3,1 Mac Pro with 1 x 2,8 Xeon Quad-Core processor, 10 gb of RAM and a native ATI Radeon HD 2600 XT.
Everything seemed to be alright, it was working, but then I tried to replace thermal paste and accidentally dropped a screw on the motherboard surface, and USB ports stopped working at all.

Then I decided to replace motherboard, bought it from the secondary market, brought that all together and ran into a problem: when I try to boot it, fans go as usual, but there is no video or chime, only white led blinking permanently.

I searched for the problem solution, followed some recommendations, but they had no effect at all.

What I tried:
- RAM re-seating
- GPU re-seating
- CPU re-seating
- booting without everything
- 3V battery replacing
- SMC reset
- NVRAM reset (keyboard seems to be not working, so idk did it help or not)

I also pressed a DIAG_LED button, here's the results:

- STBY (LED 2) come on with the yellow light
- PWRG (LED 8) come on with the green light

According to LED 8 I guess it's not a PSU issue. And according to previous actions I guess it's not a GPU or RAM issue.

So what should I do? Any ideas? Everything will be respected!

P.S.: sorry for any language issues, english isn't my native language

 

[ElBerserko]

Could be issues with memory or a memory riser card. This LED pattern happens on mine when no memory is recognized. The memory risers go in with more force than you might realize. If you can pull out a memory riser without gripping the two holes with both hands and yanking hard, it may not be in all the way. Push them in harder until you feel it definitively popping into place.

Reseating memory sticks in the risers and verifying memory is paired up correctly is also a good idea while you are there.

If this doesn’t work you might want to try a minimal setup to try to narrow down the problem. Try one pair of memory in one riser and try a single riser in both the top and bottom slots. It should be capable of booting with only one riser installed as long as you have a valid pair of memory in it.

 

[ddr3fbdimmecc]

Could be issues with memory or a memory riser card. This LED pattern happens on mine when no memory is recognized. The memory risers go in with more force than you might realize. If you can pull out a memory riser without gripping the two holes with both hands and yanking hard, it may not be in all the way. Push them in harder until you feel it definitively popping into place.

Reseating memory sticks in the risers and verifying memory is paired up correctly is also a good idea while you are there.

If this doesn’t work you might want to try a minimal setup to try to narrow down the problem. Try one pair of memory in one riser and try a single riser in both the top and bottom slots. It should be capable of booting with only one riser installed as long as you have a valid pair of memory in it.

Tried right now, not worked. Only red lights on riser card go for a second, that's all. Memory is 100% valid. I tried both risers and various memory. Maybe a riser card problem occured? Or EFI issue?

 

[KestiriX]

try booting with one cpu