Put dvd in unit and it shut down. now it will not power up at all

Unusual, but not uncommon. Sounds like a general failure of the switchmode power supply within your unit. If it will not power up at all, even after unplugging it from the wall socket, for several minutes to a couple of hours, then it is DEFINITELY a SMPS fault

Unless you are technically experienced with electronic circuits, I would recommend that you submit the recorder to an authorised Toshiba service centre (or similar agent for them), get a quote (and a second opinion - this makes things easier to determine over the long term) - the quote will give you a rough idea of the real trouble and repair/parts/labour cost(s) involved to restore your machine to original working condition - plus it will allow you to get the disc which is in it - back into your hands unharmed.

The upshot of this is the workshop quote will also allow you to make a decision as to whether or not to go further with this unit - up to you. If it proves to be too expensive, or liable to cost more than a brand new one to fix, consider replacing the unit - but only as a last resort.