iPod Classic flashing apple logo, will not reset, enter disk or dignos

Ipod Classic flashing apple logo, will not reset, will not enter disk mode, will not enter diagnostic mode.

I've been having this problem for a couple of months. It started when I had my iPod playing normally, then when I looked at it to switch it off, it said it was charging even though it was not plugged in and would not respond to my attempts to switch it off. I left it playing in my bag and it ran out of battery.

When I plugged it into the computer and tried to charge it, it would not work, the apple logo flashes randomly when I try to reset it [center and menu buttons], it does not reset. Nothing changes when I try to put it into diagnostic [center and skip back buttons] or disk mode [center and play buttons].

It will eventually stop flashing, and then when I try to reset it the same thing happens again.

After waiting a very long time [over a week] It will ask to be connected for charging, I will charge it, and it will play just fine until I touch it, upon pressing any buttons it will immediately make a whirring noise and go back to the flashing apple logo.

Please let me know what may be wrong with it and how I could fix it?

Thank you

PS: I have updated my iTunes software and when it was working, I did a factory reset through iTunes and re-synced everything, which did not correct the problem.