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Motherboard won't turn on!

  • Homebuilt
  • Systems
Last response: in Systems
January 30, 2012 10:03:13 PM

Hello everyone! I've been purchasing parts for building my own computer, and I've put what I have together and my PC won't start. Here's what I've got:

-ASUS P8P67 PRO motherboard
-Intel Core i7 2600k processor
-Corsair Vengeance 16GB DDR3 RAM (4x4)
-ePower EP-600PM power supply
-Antec Six-Hundred V2 case (irrelevant)

I installed my CPU the other night, and the board was running for a good two to three minutes until shutting off on its own. Since then, whenever I attempt to power up the board, it will get surge of energy, the CPU fan does a quarter-spin and then stops.

The standby LED on the board is on when plugged in, and that's it. I've tried just about everything: clearing the RTC RAM in CMOS, removing and re-installing the battery, etc.

This is not a RAM issue, because the board's behavior remains the same when no RAM is present. Help would be appreciated! I hope I didn't screw anything up :/ 

More about : motherboard turn

a b B Homebuilt system
January 30, 2012 11:07:13 PM

if you use rev 3.o board need bios 0804,but if oyu got rev 3.1 need bios 0105 check tha and all your connector also put one memory stick in
January 30, 2012 11:24:14 PM

How do I install bios if it won't even power on?
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a b B Homebuilt system
January 30, 2012 11:26:13 PM

when you turn it on if everything is connected correctly you should be able to see and enter the bios but not the os
January 30, 2012 11:44:31 PM

That's the thing, though. It won't even turn on. The fans won't turn and nothing will power up. I have no graphics card or anything yet, anyways. I just want the board to power up!
January 30, 2012 11:48:40 PM

well maybe is Power Supply related problem try another PSU. Also recheck that CPU is sitting correctly, ram too. then check with another PSU. and if it stills "dead" then ask for your motherboard warranty.

Best solution

a c 121 B Homebuilt system
January 30, 2012 11:53:49 PM

Looking at your component list, I would suspect your PSU.

First, check this to make sure you didn't overlook something basic:

Second, work systematically through our standard checklist and troubleshooting thread:
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. At this point, if you do not have a system (internal case) speaker, you really need one.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

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, LED's, or fan activity:

Check for line power at the PSU input. Extension cords, power strips, and power cords do fail.

If you have power and no beeps, suspect components in likely order are PSU, motherboard, and CPU.

Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

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.

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

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, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

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.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

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.
January 31, 2012 12:07:45 AM

Best answer selected by Crashed_Wave.
January 31, 2012 1:57:43 AM

I've tried everything except a different PSU. I'm thinking it's that.