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No POST, Blinking HDD light-7 Times. ASUS P5N-T

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November 8, 2010 12:00:36 AM

I own a ASUS P5N-T Deluxe board and i recently installed water blocks for the mosfets and northbridge and southbridge. So i got all the hardware back installed after leaktesting and tried to post. I got nothing except for the HDD light blinking 7 times very slowly. I dont have a case speaker so i dont know what the beeps are. I have tried the obvious stuff like 1 out of two videos cards only and one stick of ram and i get nothing. I think i might try and re-seat the cpu but i am running out of options. Can i get some help?
If the board is shorted out what will the RMA people do? I REALLY cant afford another board because i dont make much money at all.....

By the way this was my first Watercooling of the chipsets so if there is anything that might cause NO POST please tell me.
November 8, 2010 10:40:22 AM

Can some one please answer this because I see other people typing on older forums and posts but this problem is happening now!!!!!!!!!
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November 10, 2010 11:49:13 AM

Work through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.

I have tested the following beeps patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU.

Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps:
At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card. Silence or long single beeps indicate a problem with the memory.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
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November 11, 2010 1:12:44 AM

This didn't help at all because I have already done those and I have a real psu tester and it passes just fine. If it helps if I plug a Ethernet cable in the two lights stay light and do not blink. I'm pretty sure it's the mobo. Please help!!!!!!!!!!!!!
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