Sorry i told you the wrong combination of buttons (been a while since i did mine) - just tried it on mine - the correct way is....
Hold 'Home' and 'Vol -' - power on and keep holding all buttons - you will see infotmic logo screen then a black screen with a black and white picture of what looks like a moon in space - keep holding the buttons and the boot menu should appear - the whole process takes about 20 - 30 seconds so if you have not seen the menu within this time then it probably wont show and you will have to try one of the other methods which are not as easy.
Let me know how you go on
Pete
Still no joy. Thanks though. It still hangs on the Infotmic screen. I've tried holding all 3 buttons for 30 seconds and also just the Vol - and Home buttons, after the switch on. Still nothing. After this, I press and hold the power button to turn the tablet off then when I turn on again, back to normal. Very strange.