I accidently wiped Android off my Nexus tablet . I now only get the Google logo coming up and an unlocked Icon .Was trying to reinstall it with Nexus toolkit , but how do get my computer to see the tablet as I can't get in to enable usb debugging .

This seems to be a rare phenomenon but there are some instructions out there, e,g. http://forums.androidcentral.com/ask...g-new-one.html

However, if I were in that situation, I would take it to the nearest mobile phone repair/unlocking shop and ask them to sort it out.