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PC Fans, lights no beeps no posts

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March 7, 2011 12:43:55 PM

Hello,

My recent build is 4 months old and no problems until now. Have done NO OC’ing just running stock.

Last night played Advanced war fighter for a few hours, PC was running cool. Pressed power button to wake from standby (or sleep?) mode this morning and nothing. The power button was lit when I pressed it..

Powered it off, unplugged and let it sit for awhile. Powered on and lights, fans, cd click ok. But No beeps, no Post. Checked mobo cables seated properly, no joy.

MOBO lights on: dimm-led solid red, onboard power switch solid red. Tried swapping dimms (3 x 2gb) 1 at a time, no joy. Hit mem-ok on each dimm swap and the PC restarted but no post.

Tried the reset button on mobo for bios. . No joy

Disconnected HDD and Optical drives, unplugged all external inputs . . . again no joy.

My rig:

Lian-Li P50WB case with 4x fans (all controlled by the MOBO)
P6X58D premium
Intel I7-930
Corsair TR3X6G1600C8D Dominator 6gb PC3-12800 1600 MHZ 240-pin DDR3 Core i7
Intel X-80M ssd boot drive
Cd/dvd Liteon 24X dvdrw sata
EVGA GTX460
Seasonic 650w Gold PSU

Would greatly appreciate any ideas from you folks. Thanks in advance.
March 7, 2011 1:08:43 PM

Try re-seating the graphics card and only putting one stick of RAM in, and then try to get it to boot.
a c 122 B Homebuilt system
March 7, 2011 1:28:04 PM

Work systematically 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.
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.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

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:
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.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

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.
Related resources
March 10, 2011 10:46:12 AM

becandl and JSC

Sorry, been out of town on job. Thank you for the info, was hoping to not have to breadboard it but obviously the right way to go. Will get on it and let you know how it goes.

Really appreciate the detailed responses.

Lou
March 10, 2011 1:54:29 PM

Hi folks update on my problem as I first posted this rig did work great for 4 months. But never had it on overnight until this failure and in morning I had this problem.

PSU checks out ok.

I have stripped down my build to
breadboarded mobo with cpu / stock hsf then cpu/hsf/1 stick mem

And power on:
HSF runs
No beeps
DIMM-LED solid red (with and w/o mem installed

2 things I may have done wrong in initial build:

Put Artic 5 thermal paste on too thick and spread it with a razor blade trying to remove excess. still temps were always very cool. Didn't put paste on bottom of HSF.

Question: Is there a way to isolate the problem to the CPU or MOBO ?

Thanks again. . . Lou

!