First thing I would do is try using the monitor on another working computer to see if it works. If so, you have eliminated that as an issue.
Kind of hard to fathom that you got two fubar mo bo's but as they stay in the street, sh-- happens. However, The lack of a beep means that the bios is not posting. When you turn on a computer, the bios does a check of internal components and environment - if all is ok, it beeps and then has the hard drive install the operating system into the computer's memory. And if something is wrong, the bios will usually give out certain beeps that are coded such as when you have bad memory, no memory, etc. But you are getting zippo, and no video at all on your monitor - this is one of the few times you wish you had the blue screen of ***** because with that at least you know your hardware is ok but your software has an issue.
The conditions you have reported would seem to indicate that the bios chips on both units are corrupted and not working. U might also make sure that the memory chips are good. A bad chip, not a missing chip, will sometimes prevent the mo bo from booting up.
If you also remove all the memory and turn on the witch, if the bios is working it will beep like crazy. If nada, bios is dead.
If boards are new as you indicate I would return for exchange.
SOURCE: EliteGroup 741GX-M Motherboard
Your computer has memory problems. First check the video. If video is working, you'll see an error message. If not, you have a parity error in your first 64K of memory. First check your SIMM's. Reseat them and reboot. If this doesn't do it, the memory chips may be bad or they are mismatched .The CAS latency has to be the same and compatible with your M/B. You can try switching the first and second banks memory chips. First banks are the memory banks that your CPU finds its first 64K of base memory in. You'll need to consult your manual to see which bank is first. If all your memory tests good, you probably need to buy another motherboard.
SOURCE: nFORCE3-A CPU fan & LED come on, nothing else, no beep or video
If the RAM is incompatible with your board then yes it would not allow a boot. Make sure your front panel power wire is plugged into the proper spot on the motherboard and retry. If it's the RAM then you will still have the problem. If it was the wire loose or in wrong spot then it should work. Hope this helps & please remember to rate my answer. Thanks.
SOURCE: D845GRG motherboard
Depending on your processor type and speed as well as ram, to save you a headache go to http://pricewatch.com and order a new motherboard with warranty, cd and manual.
SOURCE: drivers for ecs 915p-m3
Go to this link:
http://www.ecs.com.tw/ECSWebSite/Downloads/Category_Download.aspx?MenuID=6&LanID=9
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