power supply fuse

I was wondering if any one could tell me what apower supply fuse looks like.
pics would help alot, i have an atx 250 watt psu.

 

it will look something like that this is for a xbox but is the same thing.....

http://acepcps2xbox.vstore.ca/images/fuse1.bmp

 

Assuming it has a fuse, it will be fairly obvious.

If you want pics, use Google Images.

 

if it doesn't use a fuse what does it use then?

 

Not all devices use fuses. Fuses are there for overload protection. I wouldn't assume that all power supplies have them.