Yes and that's your problem mate! I forget the value, but it definitely needs to be in there. Fuses normally do not blow for just any old reason. My guess is that another component blew. Probably a transistor or diode. I haven't looked inside an A2000 power supply in quite some time, but if there are any tantalum caps inside those puppies - that'll do the trick every time. Those particular caps are very prone to failure and usually take out more than just a fuse when they go.
If you jumper the fuse clip (if you do not happen to have a small 1/2 amp, etc. fuse) and turn it on without it being connected to the Miggy, be prepared to turn it off quick. Another educated guess is that you'll see something else start burning if you were to jump it.
Not recommended, but...
