Problem With road hog4

Hello from Greece . Please I would like little help on the problem I have with a road hog 4. A few days ago he stopped reading from usb, then began to freeze and at the end does not open. It has frozen and does not start. I have done everything, i have looked at the battery of bios, i have changed hard drive i have been trying to do boot from usb but all have failed. So ask if there is any answer to how I'm going to re-operate the hog ....Thank you very much for your time and I await your help.