We were given an older e-machines desktop computer with a standard tower. It worked fine for a month or two, but then one day we went to use it and the power up button does not even work. The power source is fine, but no sounds, no nothing. Help.
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I'm going to need even more information; The devices that use PS2 connections, which device is it, and how many of those devices do you have?
One thing that might be a problem, if the issue you see is intermittent, I would check the PS2 connector and see if the pins are bent or broken. PS2 connector pins sometimes will bend or break and this can cause some connection issues if not completely stop the keyboard/mouse from working... Also given the age of your PC the PS2 port may just be bad, but this is not a fatal injury to a computer.
Replacing the Keyboard and Mouse with a standard USB keyboard and mouse, should resolve all of your issues.
PS2 is an older technology that keyboards and mice used to run on; Now however USB connections are used.
Further more, if this an HP Desktop with 2 USB ports on the front, and 4 USB ports on the back, you will want to avoid using the 2 USB ports on the front, especially on older HP and Dell Desktops, the reason is the power supplies often do not have enough power to run multiple USB devices on the front USB ports.
The back ports should be fine regardless of the number of devices.
I assume you are using the integrated video, (on board). With a new power supply and motherboard you have eliminated all but the monitor. Try a different monitor. I have also seen a case where a computer tower worked fine in one setup with a flat screen, but when hooked up to an older CRT monitor it would not display because of the resolution settings.
There maybe to much dust build up on your cpu cooler that causes it to shut down to protect itself it needs clean about every 2 months or less to make it run smoothly.That is one solution the other solution is that your power supply needs to be clean also or replaced.Buy a can of air from your local computer store or walmart etc......
It could be overheating. Make sure all the components and fans inside the tower a clean of dust. Get a can of compressed air and blow all the dust out. You could also try removing and re-seating all your pc cards, memory sticks and cables.
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The first thing I have to advise you is to change the Power supply unit. Before buying one change it with another one (probably from a friend's PC) and see if it is working.
To remove the power supply unit, you need to remove your tower's case, and unscrew the power supply and remove it. the power supply is the metallic box on top of the computer at the back.
It sounds to me like your power unit inside the tower smoked. If you have the time and patience, replacing the power unit isn't to difficult to accomplish. You need to go to your computers manufacture online and download instructions via e-mail. There might have been a power overload that caused it to go. You can also remove all connections and take the whole tower to a repair shop to be tested. Usually $25.00 or less to verify problem. Hope it works.