This is a Dell Dimension 4500 that was working fine, and then was switched off for a few months. Now, when plugged in, the green LED on the mobo lights up, and there is faint green glow behind the power switch, but pressing the power switch does absolutely nothing. The disks don't spin up, no beeps, nothing. Also, the LEDs next to the Ethernet port don't light up at all. Usually they light up even when the computer is powered down.
I tested the PS - works fine
CMOS battery - AOK
Switch on the front panel - OK
No visible signs of blown caps, swollen caps, no evidence of anything burnt.
I tried resetting the CMOS by removing the battery for a minute or two - no go.
What is the absolute minimum config to see if it will turn on? There is no built-in display adapter on the mobo - separate card. It should show signs of life even without hard drives, right? What about RAM?
Any help will be appreciated.