New Motherboard, No Video

I just installed a new motherboard and when i turn it on no video display will come up. I tried my vid card in more than one slot and originally tried it in the onboard slot with no video card in the pc.

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I just installed a new motherboard and when i turn it on no video display will come up. I tried my vid card in more than one slot and originally tried it in the onboard slot with no video card in the pc. My mobo is Aopen S661GMX-U and is new. Everything else boots up like a normal boot (fans, hdd, drives, lights) but my monitor looks like its in standby. when i unplug the monitor cable while the pc is on, it makes the noise as if it was just turned off normally, both when the vga plug is in onboard or pci slot. the mobo has an 8x agp slot so could that be the problem? im not using the pci card in slot 1, but i tried it there too. I am pretty sure my mobo isnt 'doa' but who knows. Any ideas?

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OP
Thanks! I really want to get this system up and running.

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So, I backed up all my stuff and tried it on a clean HDD, still nothing. But I found a post somewhere that the particular mobo claims to support my 2.8Ghz celeron, but this guy said his didnt work until he put a true pentium4 in. What makes me think this might be the problem is, if i boot with no ram in, the mobo doesnt beep as it should (am i correct) and i read that this could mean the processor isnt supported. I am going to stick a P4 2.4 in there tommorow and see if that is the problem. Anyone else heard of or have any knowledge of this situation? (Incompatible processor in a compatible socket)

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Well any hardware can be finicky when it comes to other components (usually is an issue with RAM compatability with the motherboard) but CPU's are semiconductors too so I don't see why this couldn't be possible. Plus I think most Intel chipsets are less forgiving as they seem to come out with new chipsets with every new processor as opposed to AMD who has the fortune of having the mem controller on-board making for easier compatability/upgradability. I am NOT, I repeat, NOT trying to start up an Intel vs. AMD discussion. Nothing I said above is false.

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Being that I have tried different RAM that is known to be working and (supposedly) compatible, I am going to try a processor and see if that works.
 
PS. Believe me, when I get my first paycheck from my summer job i will be building a new PC featuring AMD 939