No LED Power button. PC wont boot.. Fans running in MOBO

[liamin]

No LED lights on Power button, PC wont boot.Fans working and MOBO
My machine runs as normal, all the fans are working. My PSU and Video Card is quite new, I upgraded them over a year ago. No problems since today my computer wont boot up.

My moniter is blank, there is no light on the keyboard, so Im assuming it has something to do with the MOBO. But the there is a GREEN LIGHT on in the MOBO

Already tried unplugging the Jumpers, the CMOS battery, RAM, the 4pin and 24pin connectors. Holding the Power button for 30-60 secs(with Power cord off)

I tried everything I could think of.

Any help Folks?




---------------------------------------------------------------
Specs:
MoBo: AsusTEK P5QL/EPU
CPU: Intel® Core™2 Quad Processor Q9400 at 2.66 GHz
GPU: GTX 760 4GB DirectCU II
Memory RAM: 6GB
OS: Windows 7 64-bit
PSU: Corsair CX750M

 

[speach]

What is the model number of your motherboard?

 

[10tacle]

>>PSU: Corsair CX750M

Can you swap out power supplies and test another one? Corsair's CX series is the low end and not recommended. Lots of failure reports of that line. If not, do you have a PC repair shop who can possibly do a free PSU test for you and make sure that's not the problem?

 

[liamin]

Hi Speach, I think this is my model number P5QL/EPU 99MOAC538501

 

[liamin]

10tacle - I dont think its possible my PSU is the problem as I got it new and paid $$$ for that last year. But never know you could be right, I will give my old power PSU and see if that would work. Thanks

 

[InvalidError]

If not, do you have a PC repair shop who can possibly do a free PSU test for you and make sure that's not the problem?

Most computer repair shops don't have anything remotely close to adequate PSU testing capabilities. Doing a multimeter test with a cheap meter might tell you that 5V is at 5V average. What it might not tell you is that there is 2Vpp of ripple on 3.3V or 5V due to heavily degraded output caps. Most cheap PSU testers put little to no load on the outputs and do little more than crude high/low limit testing, which does not help with revealing issues either, especially dynamic issues like transient response.

It is better than nothing, but not by much.

 

[InvalidError]

I dont think its possible my PSU is the problem as I got it new and paid $$$ for that last year.

Bad PSUs don't need an excuse or schedule to go bad. They just do. Corsair's CX series are overpriced sub-par units.

 

[liamin]

I tested it with my Old Working PSU, getting the same results. Any other ideas greatly appreciated

 

[liamin]

Its ok Problem Solved. All i had to do was REPLACE THE CMOS battery from the motherboard. It might appear that the Cmos battery has died. Had this MOBO for almost 7 years now.
Thanks guys for your help anyway.

 

[speach]

Its ok Problem Solved. All i had to do was REPLACE THE CMOS battery from the motherboard. It might appear that the Cmos battery has died. Had this MOBO for almost 7 years now.
Thanks guys for your help anyway.

Glad to hear you got it sorted.

 

[InvalidError]

That seems odd. Most motherboards will still boot (albeit with BIOS defaults) with a dead CMOS battery. All they usually do is complain about the dead CMOS battery or CMOS checksum error and send you into the BIOS setup page after pressing F1 or whatever the key your BIOS asks you to press to continue booting after the error.

 

[speach]

That seems odd. Most motherboards will still boot (albeit with BIOS defaults) with a dead CMOS battery. All they usually do is complain about the dead CMOS battery or CMOS checksum error and send you into the BIOS setup page after pressing F1 or whatever the key your BIOS asks you to press to continue booting after the error.

You get a lot of unusual behavior from "almost dead" CMOS batteries. They offer just enough charge to indicate they are functional yet they do not actually function as normal.