Vintage Synth Repair

Hello. I just recieved an Arp odyssey,black with gold 
lettering,bought it through ebay, but of course turned up d.o.a!
I have a couple of questions,wich i hope someone will be able to 
answer. First thing i did was cut off the american fuse and 
replaced it with a european one, and went out and bought a 
transformer. Fired up the unit, but nothing happened. Mine has 
no light in the power switch,so it´s a bit difficult to find out if its 
actually on or not, but i plugged headphones in the Low output 
on the back, checked the front panel to see if sync and keyboard 
were on,as well as output volume ,but i didnt get anything. 
What i´ve done so far: took off the slider caps as they were 
dirty,and cleaned them, unscrewed the unit,took some hay out of 
it, but actually i was surprised to see that apart from the hay the 
unit looks quite well (hhmm). All the keys are still in position and 
looking good, i´m taking out some of the dust inside and 
cleaning it overall. As nothing happened at all when i plugged it 
in,i assume the problem is something to do with the power 
supply. Checked the fuse and found out it´s actually soldered on,
but it doesnt appear as its blown. does anyone have any idea 
wich things commonly could go wrong ? Any help would be 
greatly appreciated.