HELP PLEASE!!! Computer won't start up

Help Please!
My computer won't start up, when I click the start up button the light comes only once, sounds click (once) and that's it, no power up.
Because of the age, I knew that the battery could be the reason, so I ordered the exact same battery and replaced it today (following the instructions very carefully). Nothing changed. Then I read about the button for resetting the power management (the one below the ram memory), did that too...and nothing.
I read the manual, it talks about recently installed components (which I have not) and explains the meaning of the numbers of blinks the power light makes with this type of failure, 2 blinks=ram memory, 3 blinks...4 blinks..more than 5 blinks= take it to service.
If somebody could please help me, I would really appreciate
All the best,
Veronica

I had similar problems with my G5 2ghz dual PPC. Mine would turn on, sometimes the startup chime would sound, sometimes not. The fans would run and continue to run faster and faster until I shut it off.
The red light comes on by the way, when the internal plastic shield is not installed or seated correctly.
Anyway, I determined after fooling with the machine for several hours that the symptoms pointed to the video card so, on a hunch, I grabbed a hair drier, pulled the video card and warmed up the video card with the drier. Then reinstalled the video card, hooked up the monitor and hit the power button. Bingo, the machine booted normally. BUT, it would intermittently hang or act odd while running so, I ordered a replacement video card. Installed it and the problem never returned. Sadly someone stole the machine last month but it was in perfect working order at the time:(

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