I wonder whether anyone can help? Recently my Dell Dimension 9100 has failed to boot consistently - that is to say, it sometimes boots properly but it often does not. When it does not boot properly, the on/off button flashes amber (rather than coming on green). When this happens, I can only seem to get it to boot properly by leaving it switched off for fifteen minutes and trying again. And even more recently the computer has started to switch itself off while I'm using it (generally on-line).
This sounds similar to a problem I had with a Dimension E310. The problem with it was a broken USB connector on the front of the machine. Check to be sure none are damaged and if they are, be sure the pins are not touching the metal casing around it. That will cause a short in the system. Hope its something that simple.
I have a Dell Dimension 9100 and I too have the orange blinking light when you push the power button. I also have a blinking 2 and 3 on the front panel. Does anyone know what this means? I looked at the USB ports, didn't notice any damage such as bent pins.
A blinking orange power light typically means a hardware failure that interrupted the boot sequence. It could be the power supply, or it could be the motherboard or even your hard drive. Try unplugging your hard drive and see if the PC turns on.