Please help!!! A1000-F won't turn back on

Both of my sons got the Lenovo Ideatab a1000-f as a gift. Within a few days of having them, one of my son's tablets turned off, while it was charging, and we couldn't get it to turn back on. We tried everything, but seeing as it was within the store's 14 day exchange period, we just exchanged it for a new one. Now here we are almost 2 months later and my other son's tablet has done the same thing. It is too late to exchange it at the store and I would like to see if anyone knows what to do before I cash in on the warranty that was purchased. When I long press the power button, the tablet vibrates very lightly for about 3 seconds then stops. If I long press the power button and the volume button at the same time, the tablet will vibrate for about 30-45 seconds and then will stop, but the tablet will not turn on. Any advice would be greatly appreciated!

I also had the same problem, my tablet just shutdown while charging. If I pressed volume buttons and the power button simultaneously then it vibrated for 30-45 seconds and if i pressed only power button then it vibrated for 1-2 seconds but nothing happened. Actually it is the problem of all devices running on this MTK chip. I thought that now my tablet is gone. But one day I thought of keeping it in charging and since afternoon I kept it in charging and charged it until next morning, and at my surprise it fired up and started to work normally once again. I suggest you also try to keep it in charging for 18-19 hours and see if it turns on. And yes don't press volume keys and power button simultaneously, by this device gets in some another mode.
Hope it helps.
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