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I'm assuming that "the fan in the back" would be the one inside the power supply. If so, if it seizes you could burn out the power supply and maybe damage other stuff as well.

Power supplies are cheap. As for replacing it yourself it will involve removing the old PS and disconnecting the power cables from the motherboard and all drives, so a little more involved than adding RAM. It is possible with some motherboards and drives to accidentally reverse the positive/negative wires when plugging in the new power supply, another danger is knocking loose a drive cable (the big wide grey multi-wire things) as depending on how much stuff you've got crammed into the box things may be a little tight for space.

If you haven't ever built a PC from absolute scratch (successfully!) I'd shy away from it. Any decent small computer shop would likely do the job for you in no time for a very minimal cost.

Good luck!

mitch is right...it doesn't take a huge amount of mechanical skill to do this, but it is a pain. Most small PC shops will do it for around $25 plus the cost of the power supply...a lot of them will do it while you wait.

Power supplies are cheap. As for replacing it yourself it will involve removing the old PS and disconnecting the power cables from the motherboard and all drives, so a little more involved than adding RAM

Power supplies are not cheap and if you are looking for a proprietary one, they are more. It is cheaper to buy a new chasis! You also have to get the proper power supply for that board, Volts/Wattage/and amps...Consult the manufacturer!