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Re: DELL OptiPlex...
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
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most power supplies have a switch for 120 and or 220 options just move the switch to what setting you want. most power supplies can be used as a stand a lone power supply, if not than you need to request for a 220 watt power supply the can be used as a stand alone for pc or computer use. most computer retail should have them in stock. look on line or at www.fryselectronics.com/computer/parts/power_supple/stand-a-lone/for_PC_use/220_watts/
type power supplies stand-a-lone 220 watts computers compatible
Sounds like the power supply is not compatible with the motherboard. If the motherboard can't support a 400 watt powers supply you will either get a blinking light or nothing at all. Those optiplex's use a proprietory power supply because of the pin connectors and how a power supply is supposed to fit in there. If you can't find a 400 watt power supply that fits then get a hold of Dell and see if they sell one for that computer.
Your automatic update from microsoft probably updated your machine and shut it off, by default it is set to update if their is one, every tuesday at 2:00 or 3:00 am and will either restart or shut down your machine.
if thats not it then your computer may have gone into hibernation or standby.
Outlet - unplug the power cable and put it on an outlet on its own
Power Cord - make sure you remove the power cable from the back and plug it back in to make sure you have a good connection.
things that cause this blinking light:
Power Supply -open system and follow cables to make sure its connected well to each part.
I/O Panel - this is where the power button is at . just open the system and follow it behind the power button.the flat cable going to the mother board , disconnect it. plug the power cable to the wall and if the system starts up then the power supply is good and the the cable that you just disconnected is bad.
If it still doesn't power up remove
and start the system.
no luck then it is the systemboard.
Here's the bad news. Dell had the 270 and several previous models made for them and the manufacturer installed cheap capacitors on the motherboards to save money. If your machine is still under warranty Dell will replace the motherboard. If not, they will sell you a refurbished one if they still have any. If you are handy with a good soldering iron, look at the motherboard and find the aluminum capacitors that show bulging or leaking from the top or bottom. Replace them with caps of identical value and higher quality. Otherwise, follow the good news. The good news is, Dell makes many more computers for you to choose from and purchase, and the capacitor problem has been resolved.
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.