What is inside this machine ? ?I had a similar problem with a Dell Optiplex GX260 which I had been given to repair. When the system was switched on, all that happened was the power button LED turned amber and not its usual green and the fans spun. No video output or any power going to connected devices. The problem was the processor. The processor had been stuck the the heat sink and the pins on the processor were not properly in place which was preventing the system from starting. After correcting this, the computer started without a problem. So I have a strong feeling that it is the processor in your computer which is causing the problem.I'm not sure what's in the computer, but I'll see if I can find out. How do I confirm that the processor is the problem, and how do I fix it if it is?Until you find out what's in there anything would be sheer guesswork.I have a PheonixBios (I FINALLY FOUND the chip) and an AMD Athalon 64 processor. both the lights on the front of the computer are on, and the monitor is receiving a signal, but it is going straight to "sleep" mode and won't come out.Try REPLACING the CMOS battery, they take a CR-2032, you can buy them almost anywhere. To locate the battery on the mother board locate something about the size of a nickel. Make sure that the computer is powered off, and that you are grounded to the computer at all times. You can accomplish that by just hanging on to the steel casing while you work.Quote from: Quantos on June 30, 2009, 08:17:06 PM

Try replacing the CMOS battery, they take a CR-2032, you can buy them almost anywhere. To locate the battery on the mother board locate something about the size of a nickel. Make sure that the computer is powered off, and that you are grounded to the computer at all times. You can accomplish that by just hanging on to the steel casing while you work.

They are commonly available at most retail stores -- discount stores like Wal-Mart, or Target; drug stores like CVS or Walgreen's; jewelry stores (though more expensive at such places [it is considered a watch battery]); privately owned retail stores which may carry a line of batteries.