Strange problem with Philips dvdr1640
 

I brought this DVD rewriter last Christmas and about two mounts ago it stop recognising blank DVD’s, I’ve tried with 4 different DVD trades. They gave me a new one, but the new one also don't recognise them, I’ve tested it in another computer and it works fine. It read cd's/dvd's and and recognise blank cd's but not the DVD’s, to clear any doubt I reinstalled windows but the problem persists. Any idea?

Pentium IV 2.4
512Mb DDR 333
Boart asus P4PE
GForce4 Ti4200
DVDR1640 last firmware
Windows XP Pro SP2 Updated