Once I power it on the face and buttons light up but nothing comes on across the main screen. a few seconds later it shuts itself off. iv cleaned and checked all connections inside and out and everythings in place except a single fuse that appears to be blown, hoping its the culprit. do I have to replace it with the exact same rating fuse or would it work with 1 of slightly higher/lower rating and were would I be able to buy a replacement fuse?

Audio Players & Recorders - Harman Kardon - AVR 120 Receiver