Yesterday when i was writing data dvd nero burning rom v6.6.16 stopped responding at lead-in stage. The disc was only spinning and the green light was also blinking even when i shut down nero and the burner refused to eject the disc. only after restarting the system i was able to eject the disc. this is first i got lead-in error. after that i opened nero express and the disc burned well. so what is the cause of the error. The dvd burner used was LG GSA H10A, DVD media used was SONY DVD+R, operating system win xp pro sp2, intel 865GBF mainboard & PENTIUM 4 2.8 CPU.