I have had the same issue with this tablet. After weeks of looking around on the net i have found a way to reset the tablet to factory settings when the power and vol down button will not work.
1. Download the firmware from the proscan website.
http://www.proscanvideo.com/item.asp?itemnmbr=PLT8235G.
2. unzip the file and copy the files update.zip recovery.img and factory_update_param.aml to an external micro sd card.
3. Plug the tablet in and insert the sd card. Press the power button to see the battery icon then press the power button 5 times. Then let it run for 4 minutes and it should be set back to factory settings.
****NOTE***** If it fails to update then you still have the access to the recovery menu where you can do the factory wipe and still reset it.
Hope this helps.
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