This is a head scratcher. I have an HP Pavilion 2.4 Ghz with WinXP Home and 376 RAM. I've installed a Samsung TS-H552U dvd burner. At first, I couldn't see the burner listed in My Computer nor the Device Manager. So, I rebooted and went into the BIOS. It was there, so I continued the boot. Voila! It was listed in both My Computer & DM. Great. It worked too! So, I rebooted just to make sure and yes, it was still there. Yippee. I then shut down completely with a big smile. But when I rebooted, it was gone again. This pattern continues: Boot & it's gone, reboot & go into BIOS and it's there. Shut down completely & it disappears. Reboot, go into BIOS and it reappears. I don't have to do anything in Setup. I just have to enter & exit. The cables are snug and it's the latest firmware. Any ideas on how to proceed?