Macintosh Classic: buzzing sound
So I have just received a Macintosh Classic from eBay, with a reported failed HDD but upon inspection it's clearly been knocked about during transit. A refund isn't an option as I got it for next to nothing, and I really want to get it repaired.
Upon turning it on, there was no display but I got the chime sound. I opened it up to reveal the board on the back of the CRT had come loose, so I reattached it and booted it back up. Not it makes a horrible buzzing (kind of electric) sound, which made me immediately turn it back off. I reopened it and booted it back up to find that the sound was coming from the clear tube that holds the board. Also, you can see faint blue “electric bolts" from said (and pictured) tube.
As the board was off when I received it and I can hear it's coming from there, I think it's clearly something to do with that. But a more educated guess and/or some tips would be fantastic.
I have checked for bulging capacitors and all of the usual things and all appears to be ok visually. As I said before, when the board was off there was no buzzing sound, that only started when I reattached it. But when he sent it, I seen pictures of the same Macintosh displaying a faulty HDD image, so I don't think anything has failed due to natural causes in the time it took to ship it.
It's a Macintosh Classic by the way.
Many thanks in advanced.