I can't tell you exactly because my dad is doing the grunt work of it all and has been working on it longer then me but now if I fix it I can have it so thats why I have started working on it again. So I'll try telling you what I know but I might get something wrong. Once every few years his work sells out the pc's with no O/S and he got one (I should also note that my dad's work place could have messed something up taking the O/S off of them, so not sure where the problem is exactly), had his friend put XP on it, and it ran well for a little bit, we used it, had it up on the network and internet and everything, and well the friend never activated it so somehow I am guessing that messed it up or something (I am not totally sure like I say) and then it wouldn't start up (by that I mean we do get a screen and such with an error message, so its fixable if we figure it out, just can't get to installing an O/S on it right now), so he took the HD out and put another one in and the one we put in is dead so we took it out and put the other one in, it starts up and then we get the 1782 Disk Controller Failure. We've tried switching out the cables and even erasing the battery, but still get it. I read up on some other forums that I could need a BIOS upgrade and that might make the BIOS read a bigger HD or a newer one then it is used to, but to get that I need the model number of the Compaq to get it off the site. I've tried looking on the front, no luck there
On the front all I get is "Compaq DeskPro", on the back of the case I get "DPEN SFF/NPC NA CTO" (whatever that is) then the serial number but nothing else. On the bottom of it I have "314280-003" then "CT:L2CC70E6JIT2SG" on a sticker towards the middle and I thought the top one was it, but I tried running it through Compaq with no luck. On the back of it there's another small label with the serial on it but nothing else. And we have another Dell pc in the same boat as this one with the 1782 Disk Controller Failure.