Liten-on 1693S blinkin LED while burning

Hello,

Since I have gotten back from my vacation my liteon 1693S drive would not burn any DVD-images anymore. I have tried different media and different software. But everytime the same thing, it sounds like the drive will burn but then powers down again like if it is not reading or writing any media. After about 2 minutes it will burn but my drive makes no sounds and only shows a blinking green LED. When I test the DVD there is nothing on it. I am using the KSOB firmware.