I have a NEC ND-2500A DVD Writer. With whom I've burned or boot CD to my computer. Since last time it was working properly but 2 days before I had used this DVD writer in one of my friend’s machine for some use, I connected my drive with that machine. There, the bios recognized my drive, and I after doing a small work I again attached it to my machine. But now my BIOS are not recognizing the drive. The jumpers on the drive are properly plugged in (to master for 2 IDE port where else to it is not) and cables are not loose. Connected the drive had also been to a computer or other, nothing. Can one do something else? And not only that much my system is also not booting.