Lanparty 790FX-M2RS

I have a lanparty 790FX-M2RS. All the fans, standby LED, ect. power up, but the motherboard wont post. I have tried everything i can think of, to get it to post, but nothing worked.

Welcome, Newcomer. Have you worked through our standard troubleshooting checklist yet? If not, please follow the link in my signature. If you have, please use the guide to tell us what you've tried and has failed.

Is this a new build, or has the system been working for some time?

Have you tried doing a breadboard?

Cleared CMOS?

May i ask what a breadboard is??

Ok,this asnwers my question of you at least reading the troubleshooting guide.

Click the link in my signature. Work through every applicable step. At the end of the guide, you'll find jsc's breadboarding guide. The gist of it is building the system outside of the case.

So, the power button can turn on the computer, but won't turn it off? What about your display problem? As odd as that sounds, it's likely you have a short either in the power button, or the front panel.

With your system still breadboarded, disconnect all front panel connections from the motherboard. Using a flathead screwdriver (or similar metal object), jump the PWR_SW pins on the mobo.

Do you hear any beeps?

Does the CPU fan spin?

Were you overclocking?

Have you tested the RAM on a different mobo?

Have you tested the RAM with MemTest86+?

Is the thermal paste dried?

The absence of beeps is concerning. Do you have a mobo speaker installed? In my experience, no dispaly is (from most common to least common) usually caused by:

1. Short circuit - Breadboarding can sometimes help; and sometimes not. When you did your breadboard, did you put everything together and test for display, or did you install only the basics (one DIMM, CPU, HSF, PSU, GPU/VGA if equipped)

2. RAM - Failing or dead RAM cause instability and display problems. You didn't hear any beeps; not even the single beep indicative of a successful POST, that could be a problem.

3. PSU - A failing PSU or a PSU that doesn't supply enough power can also be a culprit. However likely it may seem that at least one PSU would work, the only genuine test that has conclusive results would be to test a PSU while connected to the mobo and the system is turned on. In this manner, you could do a voltage test (with a voltmeter) to see if enough power is getting to the mobo.

4. CPU - You say that you've applied a fresh spread of Artic Silver 5. When you pulled off the heatsink, was the CPU attached to the heatsink? Did you check to ensure that when reinstalling, no AS5 got onto a pin? Checked for bent pins (even the slightest bend could cause problems)?

5. Mobo - The least likely is the mobo itself. Damage to mobos is more common than you might think. I've worked on computers that have had DIMM slots go bad, even when using the computer for just the simplest tasks, such as web browsing.

At this point, the likelihood of a bad mobo is apparent. For good measure, I would consider using a digital voltmeter and test any of your PSUs on the mobo.

Try the breadboarding again, this time install only the following:

1. One RAM stick
2. CPU and heatsink
3. Connect PSU
4. Use onboard graphics (if you have it) or Install GPU