Question about ASUS M3A78 Pro AMD 780G AM2+/AM2 Phenom FX/Phenom/Athlon /Sempron Socket AM2/AM2+ 5200 MHz PC2-8500 ... Motherboard

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Newly build computer problems

Just build this computer and after powering on:
No video, all lights and fans work. no POST. cd rom light stays on and opens, but does not close. hard drive spins. switch out hard (sata) with ide same problem.
Asus m3a78-t motherboard
AMD phenom 940 processor
ATi Radeon 4850 512 mb video
4gb corsair dominator memory 800
sony 16x dvd rom sata
300 gb WD sata hard drive Not sure what I did. Only my 2nd time building one, first one was perfect. thanks for all your help.

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You might not have your BIOS set to display through PCI-E. Try plugging your monitor in through the onboard VGA or DVI port and see if that produces any results. If you see the POST loading up, go into your BIOS and set your display through PCI-E.

If you're plugging into the onboard ports already, try plugging directly into your video card.

If both won't display anything, I'd try switching out the monitor.

Posted on Mar 25, 2009

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I bet your power supply isnt powerful enuf for your video card.

Posted on Mar 11, 2009

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Posted on Jan 02, 2017

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1 Answer

Same problem for me.CD-Rom doesn't work either


There could be a number of problems such as:

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No post, only motherboard light on, green.


Hey there aj1253, It seems you are getting power to the board. are the fans running?Are you using onboard video or video card. Onboard is suggested for test. I would also suggest you reseat your ram. That is removing it and ensuring it seats properly. Beyond that I would ask you provide more info ( ie is this a new build, or did it just stop working, configuration details, model #'s, et....)

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had a similar problem with a box i built. Your power supply has two connectors. One long one and a 4 pin connector. Make sure that four pin connector is connected.

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Compaq Presario 4400us


Either the new power supply you purchased is not functioning correctly. But, assuming it is now that you are getting some form of power to your PC, it is very likely the motherboard. Whatever fried your old power supply (or it could have just been the power supply itself) most likely fried your motherboard in the process. Probably not the CPU since the MB can't even post.

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Maybe a silly question to ask; but did you connect the processor power lead, as unlike some processors this needs a seperate supply.

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