Any help?

My vintage NAD 3020 isn't powering up after working fine for about a year after I purchased it.Any ideas what it could be,hoping it's a simple fix like fuses but would I change all four to see if thats the problem?Thanks for any help.
If a fuse is blown, then 10 to 1 there is a much more complex problem that caused the blow out.

I have found some devices in which it was simply the power switch that had failed. The contacts get burned out.

If you know how to use an ohmmeter, you can check the fuses. If the fuses are NOT blown, then ohm out the main power switch. Going deeper than that requires some skill and knowledge.
Thank you.