to give you the "full" story as much as i can remember,
i bought the t6212 from best buy a little over a year ago.
the original DVD-ROM would sometimes disappear from my computer, and reappear, and never happened again. i replaced my OEM lite-on dvd-rom with a pioneer unit about 6 months ago because i felt like the lite-on unit wasn't burning correctly (messed up too many blank dvd's). never had a problem with the pioneer unit after the install.
i put in a new video card (nvidia 128mb fx 5500) prior to replacing my dvd-rom. on-board video is disabled in the bios.
well, just recently, i tried to install some extra RAM which i failed to do because it wouldn't recognize all of the memory. i have 4 memory slots, 2 of which are being used with RAM from factory (2x256 ddr pc3200 400mhz). tried to install a single 512mb (Ultra brand, same spec) and would only recognize 768mb. took it out, i'm back to my original 512mb now. i'm waiting to get another 512mb memory so i can try installing in pairs.
computer came with Nero DVD-Burning software, and i never use anything else (like Roxio).
after the System Restore last night, i tried to upgrade to Windows XP Pro (i have Home Edition from factory), but after the CD reads all of the drivers from the blue windows setup screen, i get the blue screen error saying that i need to restart my computer, but doesn't really tell me what error it is...don't know if it's a bad CD?
that's it as far as what i've done to my computer. just realized that both my dvd-rom and cd-rom disappeared from My Computer, and i can't get them to reappear even after a complete system restore.
is this something i need to take to a computer repair shop (like Geeksquad?) i'd hate to pay for something like this...seems like it's something i can fix myself, but i feel like i've done everything i could...