Mysterious video problem

Ok, working on a 2.4 GHz P4 MPC ClientPro.  It was having video problems (internal video), and after determining that the CPU and RAM were good, I ordered a new MB.  Now I am having the same exact problem....You can power up, shutdown, reboot....no problems.  Once it become unplugged and plugged back in (power), you can turn the computer on, but there are no BIOS codes and there is no output.  All fans are spinning and power is flowing, but nothing else.  You cannot get a proper boot until you reset the BIOS by physically removing the battery.  Any ideas on what's causing this??
911awAsked:
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Irwin SantosComputer Integration SpecialistCommented:
when you say internal video.. you mean INTEGRATED video on the motherboard?

You may want to update the BIOS firmware by visiting the manufacturer's website (when you are able to see the screen).

it could be your monitor.. do you have one that can be tested other than the one you already have?
911awAuthor Commented:
Yeah, integrated...here's the deal.  After replacing the motherboard, i have now replaced, the CPU, the RAM, and the PSU, and I have it running outside of the case and have tested on 2 different monitors.  I'm thinking that perhaps the PSU could have been bad the whole time, and did the same damage to both motherboards.  I can see 2 bad motherboards...but 2 bad motherboards with the exact same symptoms????  Slim to none, so either the CPU, RAM, or PSU that was there before had to have caused this.  BIOS update won't do anything...This thing worked a few days ago and the hardware has been unchanged since.
Irwin SantosComputer Integration SpecialistCommented:
what is the rating of the PSU.. If you are using a Pentium 2.4.. 350watts would be a minimum with small buffer.
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911awAuthor Commented:
450 W
911awAuthor Commented:
Esentially, this is a completely new system now with all new components....the only thing that links this with the old one is the fact that the first time i hooked it up, i was using the old PSU, CPU, & RAM.  Have you ever seen an instance where a PSU could cause damage to a chipset or CMOS chip?  I'm gonna put the old PSU back in and check the voltages in BIOS.
911awAuthor Commented:
Ok, the old PSU has readings all within an acceptable range....the only thing I find very odd is that it's a cheap PSU (that came with the system from the factory) and the 12V is reading 12.000.  No fluxuations at all.  Constant 12.000.  I find that very odd.  The new PSU is going between 12.000 and 12.062.  I find that far more normal.  So again, could the old PSU have permanently damaged a mobo component?
maramomCommented:
power surges!
maramomCommented:
do you have the system on the same power strip or circuit of a power spiking device, like a tv, or anything that uses a good jolt to start out?  any lightning storms before it happened? (lightning not necessary for spike/surge however) surge protectors have limitations and even the best of them can have a surge exceed their limit.  something to think about.  :)
maramomCommented:
>>So again, could the old PSU have permanently damaged a mobo component?
definately!
Irwin SantosComputer Integration SpecialistCommented:
the common denominator and highest problem that would kill your board would be the power supply.

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Irwin SantosComputer Integration SpecialistCommented:
cool..thanks!
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