It sounds like a Hard Drive Failure. I doubt that TT or Diskwarrior will do anything to fix these errors. It is expensive to recover anything from the failed HD.
You can try to Power it down again Pull the Plug and turn it clear OFF.
Leave it OFF for at least 5 minutes then you can try to Start the Computer. If it does then be prepared to transfer anything you need from that computer a USB Backup drive.
Sorry but from what you explain don't get your hopes up.
Thank you for the info. when booting to the hard drive i now hear a clicking sound sort of like a very loud clock - not exactly in perfect time though it started that way initially. I envision an armature bouncing within the hd? I think I first started to hear this when Tech Tool started the surface scan which I guess accelerated the deterioation of the drive? also, now a small folder icon appears instead of the grey apple logo, with a question mark and the "apple face" alternatively flashing. Sign of a dead drive?
In tems of my new Mac, I want to make sure I can handle the pix and video of my two 2year old twins. I'm thinking a Mini, maybe and imac or another laptop (iBook), but should I make sure I get an upgraded video card etc.?, or should a standard issue configuration be able to handle simple home movies and burning? I havenot been following development in the wired world that well the last 7 years so I'm not as up on this stuff as I used to be.