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Re: I NEED A POWER SUPPLY FOR MY DEMENSION E520 DESKTOP
find out if it is AT or ATX cabinet
AT cabinet will have a power ON/OFF switch just like a 2 way switch
ATX cabinet will have soft switch for ON/OFF
Mostly all the new cabinets are ATX type.
To make it sure, open the cover and check the power connector to the motherboard. If its a rectangular double layer connector, it is ATX power supply, on the other hand if its a two piece single layer connector, it is AT power supply
hope this information will solve your problem
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Replace the fan as soon as possible. If the noise suddenly stops, DON'T assume the problem corrected itself. More likely, the fan completely froze and stopped spinning entirely and you're at risk of overheating something inside. Generally, there are usually 3 fans in a desktop computer (cpu/heatsink, case, and power supply) and sometimes a 4th fan if the computer has a separate graphics card. Laptops usually only have one fan.
The power supply is receiving power from the source but is unable to properly distribute it to the components. It sounds like the power supply but unless you have a power supply tester that indicates if all voltages are present the only way to make sure (and cheaper) is to replace the power supply as opposed to replacing the motherboard.
If you mean your Power Button LED is flashing amber then the power supply is receiving power from the source but is unable to properly distribute it to the components.This means that the power supply is receiving power from the AC outlet but is unable to distribute the needed voltages to the other circuitry of your computer. This can be caused bya defective power supply or a defective motherboard. Just to make sure thatnothing else is causing the problem, remove any PCI cards like modem, videocard, sound card, etc... Remove the memory modules and disconnect cables toCD/DVD and hard drives. Look at the USB ports to see if any are damaged.