I didn't have issues with the charger, was always able to get the charge symbol to show up on the tablet. It would never auto boot after sitting for a minute like it usually did.
What I did was let the tablet sit for 5+ minutes with the charging symbol showing.
Then... long press the power button only on top until it shows the boot loader. This worked for me. Now I'm in CM9 and it's up to 3% within a few minutes and doing fine.