🚀 go-pugleaf

My Mega-4 has recently developed what I think is a power-supply problem.
When I power it on, it sometimes fails to boot; the video's not working
(sort of low-intensity unsynchronized hash), the floppette light does
not come on, but the keyboard pilot light does.  Most interesting, the
fan runs at what sounds like about 1/2 speed.  Powering off and on a few
times gets it going.

Anybody ever heard of anything like this?  Assuming it is the supply,
does anyone know if I can just order a replacement from Atari, or am I
better off fighting it out with one of the local dealers?

Thanks for any info.