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bd1saul

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CMOS reset and computer will not start (no power)

I have an older IBM 700MH model 6579.  I was getting a system security error similar to the question "IBM netvista model 6578,6579: POV problem" that was posted on experts exchange on March 16, 2006.  A bios upgrade didn't help so I went to reset the CMOS.  I opened up the case, removed the CMOS jumper, and replaced it 20 seconds later.  Now my computer will not start and I mean it acts as if there is no power going to it.  Push the on button and nothing happens.  Is it possible the CMOS reset could have caused this?  
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Callandor
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Was the cmos jumper put back in the right position, Also when it was done did you remove the power plug from the power supply while the cmos jumper was removed and replaced.
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bd1saul

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All I did was remove the power plug, then remove/ replace the jumper, then put the power plug back in the back.  I took the mobo and power supply apart (so to speak) and could not find any visible damage or smell any burnt material.
You stated-->"remove the power plug, then remove/ replace the jumper"
 In order to clear the CMOS you have to place the jumper on pins 2-3 and then put it back to pins 1-2
Is this the procedure you used?

Note: The A20 CMOS clear/recovery jumper pins are numbered as follows:
 Pin 1 is the nearest to the battery.
Sorry that last bit about --> Pin 1 is the nearest to the battery. it should read -->Pin 1 is the farthest from the battery.
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Is it possible that the CMOS jumper was incorrectly placed on pins 2-3 the entire time.  Although that was not the procedure I used because I thought just the removal cleared the CMOS, not the placing it on different pins.  When I opened the case, the jumper was on the 2 pins that were furthest from the battery.  I removed the jumper and then placed it back on the same pins.  
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The position you have noted-->the 2pins furthest from the battery<-- would be the 1-2 pins or the normal position.
(Note I made a typo in my earlier post and corrected it in the next post)
 unplug the power plug beforehand.Then you have to take the jumper off and place it on the 2-3 pins which are closest to the battery for a few seconds,then place it back on the 1-2 pins farthest from the battery.. This will clear the CMOS.
Just unplugging the jumper and putting it back in the same position, will not clear the CMOS.
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ASKER

Got it!  In your experience and as Callandor noted, there isn't any reason that should have prevented the computer from powering up?  I mean the computer is as dead as if I didn't plug it in and tried to start it.
Do you have another system with a known good power supply you could swap power supplies with?  Power Supply or Motherboard are good to focus on at this time.

Hope this Helps!!!
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Based on the info from all of you, I bought a new case and motherboard/ cpu combo from New Egg.  I decided on

http://www.newegg.com/Product/Product.asp?Item=N82E16811108343

and

http://www.newegg.com/Product/Product.asp?Item=N82E16813135197

so that I could keep cost low and have a decent xp/ linux play machine.  The only mistake I made in the purchase was not realizing the case was not very high and the case won't shut with the graphics card inserted.  Not a big deal since this isn't a gaming machine but a lesson learned.  Thanks again for all of your help.