I'm hearing a clicking sound from my power supply and my computer does not boot up. I have noticed that the red light is blinking on my cpu and the cd rom drive's green light is also blinking. If i open the cd rom the computer boots up, but when i inserted a cd and close the cd rom the clicking sound will be heard from the power supply and the system shuts off. pls help.
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Sounds like the power supply is not compatible with the motherboard. If the motherboard can't support a 400 watt powers supply you will either get a blinking light or nothing at all. Those optiplex's use a proprietory power supply because of the pin connectors and how a power supply is supposed to fit in there. If you can't find a 400 watt power supply that fits then get a hold of Dell and see if they sell one for that computer.
Sounds to me like the power supply is bad cause its not providing the right voltages which is why the computer can't turn on.
Try a different known good working power supply. If it turns on then your original power supply is bad. If you still get a blinking yellow light then that means the motherboard is bad for sure and would need to be replaced.
You might try this. Shut down the computer, disconnect power cords, disconnect everything at the back of the computer, mouse, key board, etc. Open the case, ground yourself by touching an unpainted area of the case and remove the power connectors to ALL optic drives and floppy drive if you have one. (Of course do not disconnect the hdd.)
Reconnect mouse, keyboard, etc., and power cords to wall outlet.
See if it will post now. If it does I say you have a faulty power supply.
I was given a computer which was doa. It would not post, after I tried the above routine it posted then booted to windows.
I replaced the psu and now the computer works fine.
Hope this helps!
If the power box is bad, The computer will not come on. if you only get a green light, you would need to start with replaceing the power box, if you get a new one and the same thing happens, then the mother board is bad too.