TS-H552U doesn't work after firmware upgrade



Hi All. My Samsung TS-H552U DVD writer has stopped working after upgrading it’s firmware to US07. If I insert any kind of disc the light blinks for about 2 minutes and then it stops and the drive tells me there’s no disc inserted. I can actually hear the disc spinning inside but thats all.
I have been using it all along with US04. I have tried downgraded it back to US04 but still the same thing persists. I am using XP Pro. Have to leave work now where I have access to internet so will probably see your posts on Monday. Please help…