one day the PC turned off by itself .. and i heard a "pop" when trying to turn it on again. Suspecting the power supply to be defective i replaced it.
Now the puter wont start at all : power on led is on , green led on the MB too, hard drive, CPU cooler, attached devices like CD player powered on also EXCEPT floppy unit. And dark screen even with an old ISA bus video card in place of the AGP one.
With another machine ( same MB, same proc) I was able to test the floppy and the CPU : they work fine ( relief!) I also exchange and flashed BIOS chip OK..
Now when i plug the machine i hear a two tones sound ( ambulance like !)
continuous and i coudnt find a reference to it in Award bios bips alerts! am suerely not a musician !
I suspect the Chipset 440BX to be dead ... i cdnt find out what/where to test except two fuses on the MB near power connector but they seem ok.
Very difficult to test without a circuit scheme.
What would be the next step ? waste basket am afraid! but i 'd like to understand how those damned things work
please let me know if you experienced such case and investigation tips
tks in advance
Richard
Paris, France