No POST, no beeps. Error beeps without RAM.

Asus M4a785td-v evo motherboard
February 27, 2010 at 16:08:36
Specs: Windows XP
I need some help with this, please... I just built a new machine, and it won't start up. Specs:

- M4A785TD-V EVO Asus Motherboard
- Zalman 600W PSU
- 2x2GB OCZ DDR3-1333 RAM sticks
- AMD X4 945 processor

Every time I try, the Mobo LEDs light up, PSU and CPU fans start up, and both my SATA HDDs and the SATA DVD drive start up as well (each of them by themselves or even with them all connected at the same time, doesn't matter). But there is no video and no beeps.

If I remove the RAM, there are error beeps but obviously no video or POST. Removing anything else has no effect - even with just the CPU, RAM and onboard video, there are no beeps and no POST.

None of the hardware has been tested before (except for one of the HDDs) nor do I have another machine to test each piece separately on. Also I bought them from different stores so I would like to narrow the error down if possible before trying to return anything. Any help is greatly appreciated.

See More: No POST, no beeps. Error beeps without RAM.

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February 27, 2010 at 16:21:48
Did you check that all required power connectors are attached to motherboard? It is also recommended that a new motherboard is benchtested before installing in the case.

That you get error beeps without ram indicates at least that the CPU is functioning.

Re-read the motherboard manual and check for additional power connections that might be needed beyond just the 24 pin main connector.

Goin' Fishin' (Some day)

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February 27, 2010 at 16:32:02
The #1 rule to building a system is to Benchtest BEFORE you install your hardware in the case. Obviously is it doesn't work outside the case, there's no point installing it in the case. And if it works outside the case but not after it's installed in the case, it means it was installed incorrectly. Now you have no idea what the problem is.

You're getting beeps so that's a good sign. Disconnect all the drives, both the power & data cables. Remove all RAM but one stick. If you have any cards installed, remove them & connect the monitor to the onboard video. Unplug all external devices except the keyboard. Double check that you have all the cables connected securely, the RAM is fully seated & the CPU heatsink is properly installed & connected to the right fan header. Then try to boot up & see if you can get a display. If it works, immediately enter the BIOS & manually configure the settings.

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February 27, 2010 at 16:35:06
There is one additional power connector on the mobo. The
square 2x2 pins one (12V?). It looks like it's properly
connected, but if I fail to find any other potential causes to this
I'll just have to reassemble the whole thing on a bench
tomorrow. Could the CPU or memory be faulty even though it
beeps when I remove the ram?

If not it looks like I can at least narrow it down to mobo, PSU
or faulty assembly (shame on me)... right?

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Related Solutions

February 27, 2010 at 17:27:38
In this case beeps are a good sign. They indicate that the motherboard and CPU are working. The fact that you get no beeps with the RAM installed tends to indicate a RAM problem. Most Mobos output a single beep to indicate the Mobo is ok.

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February 28, 2010 at 08:09:08
I tried booting with only one of the ram sticks at a time and
found out it will boot just fine with one of them, but not with
the other (or with both). I've reconnected all other devices and
everything works as long as I don't plug in that other stick of
ram. So it looks like we've found the culprit. Thanks to all of
you for the help!

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