MotherBoard

Don't quite understand you issue, however...

Quite frankly, your system would not be functioning if you had a serious Motherboard problem, but if you suspect something is not quite right, try a Diagnostic Utility Program from a company like the following.

There are many of these out there which can do the job.

WinTune 98
http://download.cnet.com/downloads/0-10102-100-1727484.html?tag=st.dl.10001_103_1.lst.td

SANDRA 2000
http://download.cnet.com/downloads/0-10102-100-1565773.html?tag=st.dl.10001_103_1.lst.td

Symantec Norton Utilities
http://www.symantec.com/nu/index.html

First step is a check for motherboard responce for memory lack. Install a CPU only, attach power and system speaker. Turn this on. If spk starts to issue beeps then this stage is OK. Install memory module and repeat. If in ithis case your MB generates another kind of beeps (requires video) then all is OK too. Consequently install video, HDD, and so on. In such a manner you can locate the source of troubles.
Hope your MB is working.

PS. If your MB stopped to respond at April 26, then probably you need to recover (reprogram) the contents of your BIOS. It's probably due
to Chernobyl virus.

Bye.

Yes, but you haven't mentioned what is going on. If your motherboard stops working (as in completely broken) then your computer would not even turn on. However, if portions of your motherboard are misbehaving you may not know which portion or how it will manifest itself. You may get spurious lockups, abends etc. The only way to figure out what is going on, is to remove as many hardware/software components and then gradually add them back trying to recreate whatever problems you are experiencing.

I very like 2nd answer. Something more.
1) Some older MBs didn't work without memory.
2) Disconecting EVERYTHING except speaker and power from MB is good idea. Bad cable to HD caused total disfunctionality of MB, that did not anything staying completely silent.
3) Minimal system: MB, VGA, KBD, floppy. Bootable W9X diskette. Try DOSDIAG from BCM diagnostics.

YES!

First step: When you power on the computer, does the power source fan run? If not, check power cable and even power plug (embarrassing if plug is on light switch which is turned off). If power fan runs, but nothing else happens, disconnect and remove EVERYTHING but the CPU & fan. Does the CPU fan run when the power is on? If you recently replaced the motherboard, check to make sure it is not in contact with the case (No metal on metal contact). Get a bios "beep" translator if your computer is beeping at you - it tells you what needs to be added to your motherboard to run. Check your motherboard jumper settings to make sure they are correct. Add everything back to the motherboard ONE PIECE AT A TIME, powering on after each is added. Continue to find if any of these pieces are causing the problem.

Not enough info given, There can be numerous things going on. Was it working earlier and now there is a problem? Is this board new? Are you building a new ATX system? What is going on?

For all intents and purposes, the motherboard IS the computer. All the components (processor, memory, drives, ports, etc) are connected to the busses on the motherboard. What is the exact nature of your problem. Do you turn on the computer and getabsolutely no response? Please give more details.

Yes.. Your machine would not boot and or you would have a series of problems including beeps.

Oops, I've forgot
If AGP port is presented on your MB then remove video card and look into the slot (using good light source if needed). Often contacts in the slot become bent when installing an AGP adapter. This may be repaired in a hardware sevice centre.
By the way, visually check other contacts and chips for mechanical damages :(.

Answering you question, as it reads: yes you would know if it wasn't working.
The PC would either fail to boot, or would lock up, give blue screens etc.

If oyu are having a problem with a PC (your question isn't clear), Try turning it on with the PC/Monitor as the only dec\vices connected to an outlet.
Having printers etc on the same power board can stop boot ups. The other answers pretty much cover any othewr problem
E.

There are many factors which could influence the answer to this question. Did you type this question on your computer? If so, at least some of your MOBO is working. I am not in the position of being able to judge whether you would know it or not.I hope this helps.

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