Hello and welcome.
I, like you, was absent for a number of years.
My interest was rekindled with the Emulator scene and then with the purchase of a 4000D of EBAY FCUK!!!!
I was sold a bit of a duff that I've now eventually got working correctly.
Battery had leaked and the sound was knackered. Both now sorted out by myself after learning a few tricks on the different Amiga user sites.
Just a work of caution - check out that battery on a regular basis if you've got the original type of battery fitted. They can and do leak and bugger up your motherboard.
Dave G 8-)