It sounds like hardware failure to me. Just because it has not been used much doesn't mean that it wont pick up a fault. If you have another machine you can test it in pull it out and confirm that it is the drive and not the PC itself.
I had a similar issue with the PATA DVD drive on a Vista computer. After changing cables, jumpers, etc., the problem was finally traced to the IDE controller on the motherboard. To solve this, I replaced the PATA DVD drive with a SATA DVD drive, and now things are fine.
In your case, it is either the DVD drive, OR the IDE cable, OR the IDE controller on the motherboard.
You may want to consider the option of a SATA DVD drive.
yes i am sure that this is hardware failure, because its just fine on first, but suddenly problem later. i do checked inside by disassembly the drive,looking for any suspicious broken electronic part or lines, but everything looks smooth perfect. i also confirm that another IDE dvd drive works well on my machine, so thats mean no problem to my motherboard IDE controller. i'm just so curious what make my samsung drive goes wrong and how to solve it.
DVD drives, like other electronic components, do go bad and fail sometimes. Glad that it is not the IDE controller on your motherboard. These drives cannot be repaired (cost of repair is prohibitive). They are inexpensive and available for around $20 each.