Toshiba A200 Recovery Mystery: DVD just pops out

The Vista Home Premium DVD I'm using to "recover" the factory settings on my Toshiba A200-TR6 (purchased in Canada) pops open before even beginning the recovery process....

So, I'm trying to recover my Toshiba notebook so I can sell it. Up until this point I've been running it with XP Pro (and Toshiba's sad excuse for XP drivers -- the sound driver in particular); I'm keen, however, to sell it in a factory-fresh state.

Problem: DVD #1 of 4 just pops out after booting into the "Toshiba Recovery Wizard." It does get as far as the "initializing partition" part, and then says, "Copying files. please wait." At this point the DVD just pops out way too early saying: "Please insert next disc and press [OK] to continue."

But it hasn't done anything! Obviously when I try inserting the next disc it just pops out too (since nothing's happened).

The harddrive had been wiped using the tool recommended by Toshiba here to remedy a different error that pops up when trying to recover/restore using the recovery DVD when another OS (XP Pro or Vista) is already installed.

In sum, XP Pro installs fine, and Vista installs fine when using the method and files offered here (i.e. when not using the recovery discs). This method, however, refuses the product key on the bottom of my machine and, well, I'm not so keen on the idea of having to sell a computer that requires questionable workarounds, etc. to get it working.

Thoughts? BIOS settings? SATA something or other? Hard disk controller? It's still under warranty, FWIW. Warranty recommendations? Can MSFT send me a "real" version of Vista (since I seem to have received a useless one)? Also, Toshiba has already replaced the DVDs once, since I thought that the ones that came with my computer were defective. No dice. Thanks!