I'm a student working in an IT department at my college that i'm attending and I have been brought a gateway LUX E4300 seires computer made in 2005, with a boot problem. When brought, the ticket stated that it had a memory error (the three beeps) and that the Computer wouldn't boot. I took the RAM out and tested it in other machines and concluded that the RAM was good and working fine. However the computer still wouldn't boot. The Mobo was getting power but when you hit the power on button in the front nothing turned on in the machine accept the light for the power button. The fan didn't initiate and the ethernet USB orange light didn't turn on. One of my Co workers gave me some advice to unplug the power supply from the computer and "pump" the power button for about 15 seconds to drain all the power out of the computer then plug the computer back in and see if it turned on. After doing this I plugged it in and the fans kicked on, brings up display on the monitor, and runs like nothing has happened at all. However when my Superior whom I have to give all computers to before they are sent back out into the field tried to power it up. He got the same problem without the memory errors. The power button turning on and no fans running or anything else. I took the computer back, "pumped" it again and it works perfectly fine. Any advice on to what to check or what might be going on?