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New build won't operate

Building a new system using an ASUS A7N8X-X motherboard with AMD Athlon 2500+ CPU and 512 MB RAM which is identified as correct for this configuration. Have installed all in an ANTEC CS600 case along with a new 450 Watt power supply and a new floppy drive. I am using my old 128 MB video card which is working. Connected keyboard, mouse and monitor. No HDD installed or any other cards. Plan to install them one at a time so any problems will be isolated. Problem is, on turning on power the power supply, case and CPU fans all operate and there is a green light on the motherboard which also lights, but monitor stays black. No speaker in case so don't know if there are beeps, but I doubt it. Do I have a DOA motherboard, a DOA CPU or is there something else I should check first?

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In reply to: New build won't operate

A case speaker is very useful in these situations as the beep codes give alot of clues as to what may be wrong as in memory probs or video etc.

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How do you know that your video card

In reply to: New build won't operate

"is working"??????????? Is it an AGP, do you have onboard video, which may be conflicting with a plug in card??? AGP cards are sometimes difficult to plugged in fully. Reseat it.

Really frustrating trying to toubleshoot sans video.

Not sure why you doubt that there would be beeps.

Are you certain that the mobo isn't shorted to the mounting plate by an errant hex standoff? If they are only to the mounting holes surrounded by a ring of printed circuitry, they are grounded and that IS proper. None should be touching the bottom of the mobo on any of the artwork. And no, the "insulated" washers that came with the case are NOT to insulate the mobo. They go under the mounting screwhead to prevent the screwhead from damaging the artwork during tighteneing. Each of those mounting holes are connected to each other through the ground plane in one of the inner layers of the mobo, and thus to the mounting plate, legitimately. We are looking for illegitimate grounds.

Best way to eliminate this as a possibility is to pull the mobo out of the case and mount it on a large piece of cardboard. No, don't use electrostatic bags, they are conductive.

To check the CPU, there may be a local shop that will give it quick check for a few bucks, same with memory.

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Video card

In reply to: How do you know that your video card

I'll try the cardboard idea. Video card is PCI and I reinstalled it on the machine to be replaced and it works fine. Pretty sure there is no onboard video, but I will double check.

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In reply to: Video card

If you could try a working 1.5v agp video card.
But if you have no beeps and the speaker is wired correctly the board is not detecting video or mem I think if video card is removed it should be 1long 3short beeps or no mem installed constant short.
450 should be lots of pwr

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In reply to: How do you know that your video card

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ASUS response

In reply to: New build won't operate

Tried all your ideas without posting and finally went to ASUS and asked if they had other ideas. They sent me a todo list and some caveats. One thing they wanted was a power supply capable of putting out minimum amps for the DC power supply. The PS met all their requirements except for the +3.3 voltage rail. They wanted at least 28 amps, but the PS is only rated at 22 amps. Could this really be my problem? PS. the board does not give out post beeps even when I try to power up without the cpu in place.

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Modern memory does consume

In reply to: ASUS response

a lot of power and generate a lot of heat.

If you have the maximum amount of memory [probably 4 GB] Asus may be correct. But you only have 512 MB.

With regard to beeps sans CPU. Did you finally get a case speaker??? Didn't have one when this thread started. LOL

Of course, if the CPU is dead, having it removed won't make a difference.

Troubleshooting without video has to be the most frustrating of all situations. You are simply at the point of remove and replace trouble shooting.

If all of the parts are new, and bought from different places, make a case to get them each replaced.

With a PCI video card I doubt if the power supply is overloaded.

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