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ASUS M4A785TD-V EVO doesn't POST

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May 25, 2010 2:03:36 PM

I have a ASUS M4A785TD-V EVO motherboard, Phenom II x4 955, and a Corsair 650w PSU.

When I plug just the 24-pin power connector in and press the power button on the case, all the fans spin up but there is no video output. I tried both the integrated and discrete outputs.

Then, I noticed that I didn't plug in the 4-pin 12V connector. I plugged that in, but that made it worse. Nothing spins up at all when I press the power button, and there is also no video output.

There aren't any beeps either, but maybe that's because I didn't plug in the motherboard speaker. Does it come with the mobo box? I don't think I saw it when unpacking the mobo.

More about : asus m4a785td evo post

a c 295 V Motherboard
a b Ĉ ASUS
May 25, 2010 3:09:24 PM

Hi newcomer and welcome to the Tom's hardware forum.

Do u have the correct BIOS version for support that CPU?
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May 25, 2010 3:14:08 PM

ASUS's website said it supports the 955, so I don't think an outdated BIOs is the problem.
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a c 295 V Motherboard
a b Ĉ ASUS
May 25, 2010 3:29:17 PM

U need at least the 1.00G BIOS version. Check if that is the version that u have, it's only for discard one possible problem.
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May 25, 2010 3:34:53 PM

Okay, I'll check when I get home.

But I don't understand how having an outdated BIOs will make the entire mobo not start up when the CPU connector is plugged in while it starts up the fans with just the 24 pin connected.

Also, if it is an outdated BIOs, how would I go about updating it if I can't even get it to POST?
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a c 295 V Motherboard
a b Ĉ ASUS
May 25, 2010 4:58:36 PM

When u have a BIOS that don't support the CPU, the rig don't boot up even if u can see the fans spinning up.
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May 25, 2010 9:55:51 PM

Nevermind, I got it working.

It appears that I plugged in the 4-pin connector the wrong way! Ha!

Everything's up and functional. Thanks for the help, and sorry for wasting your time.
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a c 295 V Motherboard
a b Ĉ ASUS
May 25, 2010 10:05:06 PM

Don't worry we are here to help u and don't was a wasted of time, both learn the lesson. Connect the 4-pin in the correct way.

Enjoy ur rig.
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August 29, 2010 12:12:17 PM

Hello there,

I have a similar problem: no fan will turn on (not even the power supply fan).
My 4 pin is inserted correctly, though ;-)
I checked the PSU independently and it works fine.

Can you tell me how to go about updating the Bios - which was suggested in this thread - when nothing comes on?

Thanks
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a c 156 V Motherboard
a b Ĉ ASUS
August 29, 2010 4:55:45 PM

You need to be able to download and run the BIOS update. That means installing a CPU that the motherboard does support.
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Anonymous
a b V Motherboard
December 16, 2010 6:07:18 AM

I've got almost the same exact setup as OP. And I'm getting the same exact problem as OP. My connections are on properly, though.

The motherboard supports AM3. So I know the chipset is ok.

I have a PCI Express video card. When I try plugging that in, the computer doesn't even power on. When I press the power button, a light on the card blinks real quick, the fans move for a split second, but nothing turns on.

Any ideas? Bad mobo?
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