I recently bought a second-hand computer.
The specs (that I'm aware of) are:
AMD Athlon 1600+ XP
256 Mb SDRAM
20 GB HDD
OS XP Home Version 2002 (including SP1, (SP2 has recently been installed from CD))
When it was delivered it appeared to be functioning perfectly.
A couple of days ago, I removed the original cd-rom drive (Samsung CD-Master 48E Model SC-148) and installed a DVD CD-Rom (Samsung DVD Master 12E Model SD-612 and a CD-Rewriter (Samsung CD-ReWritable Model SW-408).
Both worked, without any problems. I tested both "new" drives. I installed, from the original disk (CYberlink Power DVD 3.0) I had from the old computer for the DVD drive and was able to watch the beginning of a commercially produced DVD (Gladiator - if you're interested) and I copied (and then deleted them) some random files to a CD-RW disk using XP's own copying facility.
I then added 256 Mb more memory (again, from the old machine). This memory was recognised and the machine self tested the memory, as usual, at boot up. Everything in my garden appeared to be rosy - then I think I did something stupid ( :o ).
There is no excuse, really. I installed (Samsung Electronics\Adaptec) Easy CD Creator and Direct CD for Win 95/98/2000 and NT 4.0.
XP warned that this software had known stability issues with this software - which I ignored and continued with the installation.
6 or 7 reboots later, the machine no longer recognised any drive but the HDD and whilst the operating lights on both units flashed at boot up, neither caddy would open and the HDD light remained on constantly.
I have since removed the software, the extra memory, both drives and replaced the original CD-Rom drive. Still no recognition by the machine (there is even no mention of either them or the replaced CD-Rom drive - although the caddy does open and the HDD light seems to be operating normally - it goes out when it's supposed to) on the boot up screen or on the device manager screen (Control Panel -> System -> Hardware -> Device Manager).
My biggest concern is that the machine itself only recognises the HDD and therefore I've broken it badly - can someone please give me some idea of the possible causes for this (apart from my own idiocy) and please, please give me some ideas on how to fix it.
Any responses will be greatly appreciated.
Thank you for your time, patience and (hopefully) know-how