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It could be your PSU(Power Supply Unit) or your motherboard to test your PSU use a voltmeter 1-Unplug PSU from motherboard and all unit in the PC 2-Put a small wire between black(GND) and green(PSon) wire 3-Test voltage Orange is 3.3V Red and purple is 5V Gray is PWRGOOD(or PWROK) it must be at 5V Yellow is 12V Blue is -12V White(optional) is -5V
most power supply units will fit you can get a larger wattage output eg: heavy duty if you have added any more devices to your computer more RAM,a larger hard drive,more cd/dvd drives these added will put a greater need for wattage output on the PSU you should check all the electrical connections before you make a decision and make sure they are the same as as the ones that you will need to run your computer also check the measurements inside the frame to make absolutely sure it will fit you can get lots of PSU
Close examination of your power supply may reveal if the psu is bad.
When the power supply is plug in ac socket the green indicator led inside the motherboard will lit steady green. See if by turning on the cpu you will see some sparks in the power supply connector attached to the motherboard. This is a clear indication of a bad or shorted psu.
You can also smell if there is a burning inside the psu.
See if the fan inside the psu is working if not then its a clear indication of a bad psu.
Using a multimeter if you have one measure the dc voltage coming from the supply connector. Insert the black probe to one of the black wires in the connector. And the red probe to the red wire in the connector. the reading should be +12VDC. Put the red probe to the red wire and it should read +5VDC. Any readings below this, means bad psu.
Measure also the output voltage when there is a load in the power supply. Connect a CD-ROM drive or hardisk and measure again the voltage. Dropping of voltage when put some loads is a clear indication of a bad power supply unit (psu).
I hope this will help you. Thank you for using Fixya!
Hi there. Rocket Fish RF-550wps PSU is standard ATX power supply. Dell tend to use their own power supplies which differ slightly from standard power supplies. I suggest you take or send the Rocket Fish RF-550wps PSU back as it won't fit and order one from Dell themselves, at least then you will have a guaranteed fit. Once you have your new power supply from Dell (or a Dell ATX power supply) it should be easy to fit in. Post back if you need any more help.