All I get is...
the blue "Power on" lite stays on for about 25 seconds,
then goes off for 1 second, and that routine continues.
On for 25, off for 1, on for 25, etc...
Sometimes the fan starts up for 1 to 3 seconds.
When a Startup disk is in the DVD drive, it sounds like it's working,
but it gets interrupted by the "power down" after 25 seconds.
Nothing ever appears on the screen. And I hear no Beeps at all.
I've gone thru the "Black Screen Issues and Troubleshooting" thread at
Removed the CMOS battery for 20 minutes.
Re-seated the Hard drive.
Re-seated and swapped the RAM.
Removed the DVD drive.
It's now time to remove the bottom to find the CPU.
Where are there some instructions for disassembling a Compaq Presario F500 (F558US)?
Thanks very much.