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I just put a Dynex 400-watt power supply in my HP pavilion m7480n. to get the wires to fit in the back inside like the old PU, the fan is faced downward toward the CPU fan. Is this ok?
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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.
Is this a new ATX switch mode power supply?
If the ATX power supply is old then the capacitors may leak and overheat to give a burn't smell. I would not advise you to try and repair these power supplies, they operate with dangerous mains voltages inside the case.
The ATX power supply has standard mountings holes that line up with the desktop case and can only be fixed to the case in one position.
If you have overheating problems you can add addition 12volt fan inside case, The fan should be positioned to draw air into the case.
You will not find a power supply for this case. Why would you want to upgrade such an old computer? Get yourself a new one with amply power for your needs. If you are one that upgrades regularly, get a standard case with standard components that can be upgraded without the hassle of replacing proprietary form-factor compnents.
as long as you have the 20 or 24 plug in and the 4pin square plug in plus the hard drive dvd floppy fans i donot no your motherboard or graphic card so i cannot say anymore only next time write down your conections before removing power supply or get manual for your pc
I would recommend picking up a higher watt power supply just to keep up with the changing demands on computers. They are not to do yourself. If still wondering what cards can go with a 300 watt power: Maybe an ATi Radeon 9250 256mb? It seems that a 350 watt power supply should still be minimum nowadays and they are cheap.
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