Computer powers on Screen Blank Help!

[IceRedwing]

My rig has

Asus P5N-E Sli 775
E6400
Corsair Dominator 2GB
680W Thermalright Purepower
2x 8800GTS 640mb

I was air cooling it before with a Vigor Monsoon II and it was running fine, I decided to go with watercooling so I remove everything and install the waterblocks & etc. I ran the waterloop for 24 hours and it ran fine without leaks.

So I finally install the rest of the system and power the computer on.
Computer powers on and all the parts power on. But the computer isn't posting.
The monitor stays in power saving mode and never comes out of it.
I tried removing the motherboard to check if the case is some how shorting out the motherboard, but all the screws have washers so I'm kinda stumped. My only other assumption of a possible short is the raisers from the motherboard tray, they are your typical metal raisers but I can't put a washer on them because they fall off the moment I put the motherboard on. Plus I didn't put washers when it was still being air cooled and it ran fine, so i'm not sure why it would be a problem now.

I tried using different RAM slots and no cigar, i tried putting a 120mm fan on the CPU plug on the mobo (just incase the PC won't power up cause of no signs of a CPU HSF. Reset CMOS also and no luck.

Any help would be great, because i'm getting pretty frustrated after spending 400 dollars on new cooling and the computer isn't working.

 

[wanderer27]

Not too familiar with Water cooling, but does it have any type of connector that goes on the CPU fan pins?

My thoughts are the System isn't detecting a CPU fan and therefore won't start up.

Just a guess.

 

[IceRedwing]

i already eliminated that possibility by plugging in a 120mm from the radiator just so it has something connected to the CPU fan.

I'm assuming that perhaps the motherboard might be broken, but i'm unsure why it would be.

 

[Sdiver2489]

Seems like a power problem...which I suppose is possible....although I would have thought you had enough.

 

[IceRedwing]

i don't really think it would be, i tried disconnecting a few things. Plus the loop is running from an extra 550W PSU that I have. I was using the 2nd PSU to power the pump while connected to all the parts without turning on the PC.

Anyone have any experience from this?

Normally when this happens to me, it is because the bios settings was too aggressive, but right now it should be at default with the cmos reset.

 

[IceRedwing]

any assistance would be appreciated

 

[MegaVovaN]

Did you try one video card? Maybe one (or both) are DOA?
Completely take apart the PC and run on a table with only essentials connected.
Does mobo have any kind of signaling device? s939 MSI mobo I used for friends build awhile ago had a little PCI card with 4 LEDs, depending on the combination of red/green LEDs I could tell what is going on (looking in the manual).
Is the screen connected to video card(s)?

 

[IceRedwing]

the video cards didn't arrive DOA, because i had the whole system running on air for about 2 months before switch to water.

Plus, I tried running it on 1 video card at a time and it didn't work either.

I've yet to try running the motherboard by itself though.

 

[IceRedwing]

any other possibilities?

 

[IceRedwing]

bump

 

[myocardia]

You aren't getting a POST because you've reset your BIOS, and your RAM isn't getting enough vdimm to post. Remove one stick of RAM, then raise your vdimm to 2.1-2.2v, then shut down and add the second stick.

 

[IceRedwing]

that wasn't it either, when i was testing it, I had it with 1 stick of 1gb.
I tested it last night with my air cooling as well.

The processor heats up but nothing happens.
I'm guessing the motherboard was damaged