Swap the monitor - it works on another PC.
Take a working Monitor and plug it into the bad computer
you see the same symptoms: No LED or display on the Monitor.
The bad computer is two (plus) years old.
The Power Supply is suspect.
We barrowed an "ULTRA" Power Supply Tester.
Here are the Test results:
20-pin connector. All LEDS light up except
one, LED (-5V) doesn't light up.
HDD & Floppy test results: All lights light up (+12V & +5V).
The P4 connection test result: Only the +12V LED lights up.
the other, LED (+5V), doesn't light up.
We'll replace the 200 Watt Power Supply.
Will replacing the power supply solve the
"No LED or display on the Monitor" problem?
Reading other posts, we are beginning to think the motherboard may be at fault.
Is this a common power supply failure symptom?
Finally, How long should the computer "last" after the
power supply is replaced? We always thought losing the power
supply was just a harsh reminder to replace the the computer.