MG100 HDFX no power HELP!!

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Ok, so I bought a used MG100 HDFX and 4 * 12 angled cab. it was all working fine apart from the fan being a little loud. I decided to replace the fan with a standard PC 50mm fan and that all worked fine. Now here's where I get stupid...
Wanting to see how much noise the new fan was making, I tried to stop it by jamming a pair of pliers to stop the fan turning. unfortunately, this resulted in a large amount of sparks being produced from the little heat sink thingy behind the fan, as well as a loud noise being emitted before everything went quiet. Now, the amp refuses to turn on at all. I don't think the fuse is broken and have tried a new fuse with no luck, and am really hoping this is a simple fix.

Many thanks in advance.
 
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