Help with teclast A10t - Android Q&A, Help & Troubleshooting

Hi friends,
I need help.
I bought a teclast A10t few days ago.
Today i tried to upgrade it to ICS 4.0.3.
I didn't understand something while doing the process
and now - it won't turn on.
No matter what combination I do (connect USB, Press VOL- and press power 4-5 times) - the screen remains black. No feedback. Just black.
I have the hunch that I turned it OFF during uploading, although I turn it off 1 minute after the process begun.
Please help.
I don't know what to do in order to get some response from this tablet.
Thanks

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