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Use caution, some older Dell machines used a non standard, proprietary pin-out on the 20 pin connector ALso the 6 pin is suspect. If you connect a regular ATX PSU, you will fry the MoBo. Look here DELL ATX motherboard Power Supply pinout
Dimensions 5.9"W (150mm) x 3.4"H (86mm) x 5.5"D (140mm)
Special Features Dell Proprietary Main ATX & 6 Pin Auxiliary Connectors
AC Input 100-120V/7A 60Hz 200-240V/3.5A 50Hz
DC Output Voltage 3.3V 5V12V
Total Output Max Load 200W
TAKE THE OLD ONE OUT OF THE MACHINE, UNPLUG ALL CONNECTOR AND LABEL THEM EACH. TAKE IT TO ANY COMPUTER STORE THEY SHOULD BE ABLE TO HELP YOU
IT IS 4 SCREWS PHILLIPS TYPE, POWER SWITCH
BUT THE MIN. POWER SUPPLY SHOULD BE AT LEAST 250WATTS
AND HIGHER IF YOU ARE GAMER, GRAPHICS NUT, ALOT OFF
first you switch on the supply by shorting (green and black )wire in output socket of smps.then check output voltages.If there is no voltage then check switching transistors or protection transistos that is placed on first hit sink.check primary bridge and capacitors for open.
Yes you can replace the old defective power supply with the new atx but the problem is the size. It the size it fit to your computer nothing to worry because power supply now is almost the same output only the wattages changes.