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ASUS M4a78 Plus, No Post or Video Output

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November 21, 2011 2:12:25 PM

I have an ASUS M4A78 Plus motherboard which I have sent in to be repaired 3 times now with no progress whatsoever. They claim it works fine.

When I start the computer, there is no video output at all and there are no post beeps (unless I take out all the ram, then I get an appropriate error beep sequence). The lights on the connected keyboard turn on and off as if it is trying to boot up repeatedly.

The graphics card I am using is brand new, the ram is apparently fine (I tried 3 separate sticks which I am pretty sure work fine and one that I know is bad, I got error beeps for the bad stick). I have no way of being sure that the CPU is working properly though, it was in the motherboard when this problem started happening.

I can't seem to find any documentation on all the post beep patterns that I should have for this motherboard's bios, so I'm not sure what no beeps could mean.

More about : asus m4a78 post video output

November 23, 2011 12:02:37 AM

just bought a new psu as well (RaidMax RX-730SS), no change
tried another new cpu which has been sitting in it's box unopened (AMD Athlon X2 5000), no change

Also bench tested this time, instead of in case
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December 27, 2011 7:22:12 AM

Ended up getting a new motherboard... and i have the same problem with this one. Everything is new except the ram, but shouldn't there be post beep error codes for bad ram?
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December 5, 2012 6:44:34 PM

takums said:
Ended up getting a new motherboard... and i have the same problem with this one. Everything is new except the ram, but shouldn't there be post beep error codes for bad ram?


did you find a solution to this? my M4A78 Pro is doing the same thing after my powersupply died.
I've replaced it with a new working powersupply (lights and fans go on on the motherboard) but i get no POST or video output?
thanks, Simon
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January 23, 2013 8:40:27 PM

yeatsie said:
did you find a solution to this? my M4A78 Pro is doing the same thing after my powersupply died.
I've replaced it with a new working powersupply (lights and fans go on on the motherboard) but i get no POST or video output?
thanks, Simon




I am having the same issue.

I had 2x 2GB sticks of ram in the yellow slots, and the same thing as you guys described kept happening. I removed one of the sticks (which was good because I alternated them later) and my video would work... however the system would now freeze at the screen where you should be able to press <DEL> to enter bios or <tab> to display bios post message.

I called Asus support and asides from suggesting I clear the cmos (which I did), they could not offer any info that would help. Even if you get an RMA, the 20-30 bucks it costs to ship is not far off the cost of a newer silimar board.

If anyone has found a solution or thinks they can offer some advice, it would be more than welcome.
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May 10, 2013 6:40:11 AM

Exact same problem as others in this thread so still hoping somebody will find a solution!



MrSeanner said:
yeatsie said:
did you find a solution to this? my M4A78 Pro is doing the same thing after my powersupply died.
I've replaced it with a new working powersupply (lights and fans go on on the motherboard) but i get no POST or video output?
thanks, Simon




I am having the same issue.

I had 2x 2GB sticks of ram in the yellow slots, and the same thing as you guys described kept happening. I removed one of the sticks (which was good because I alternated them later) and my video would work... however the system would now freeze at the screen where you should be able to press <DEL> to enter bios or <tab> to display bios post message.

I called Asus support and asides from suggesting I clear the cmos (which I did), they could not offer any info that would help. Even if you get an RMA, the 20-30 bucks it costs to ship is not far off the cost of a newer silimar board.

If anyone has found a solution or thinks they can offer some advice, it would be more than welcome.


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May 10, 2013 7:00:01 AM

try out case, or a VGA plug, shake, gently lock not too tight so that the position of the straight VGA, sometimes a hole in the case is not straight with lock VGA, VGA so it will be slightly tilted position and it will not be read by the boot system .. good luck
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