On which version? 30k, or 90k? If it is you 30k, maybe it is your laser (not in best condition?).
What do you mean by "the screen flashing".
So,... You start a burned DVD-Video-Disc on your PS2 (be it 30k, or 90k) and the PS2 stops after some seconds,...
PS2 V7/DMS3 V2 (FW:2.4b7); Seagate Baracuda 200GB
PS2 V7/CC1.0 (FW:34 hacked v2 BM:2.1.6); Maxtor DiamondMAX9 PLUS 160GB
PS2 SCPH-30004R; NoMod+NoLaser
3xSony MC 8MB
MAX/Datel 16MB with Boot-CD
Custom FMCB 1.8b+ Beta-Build, my AIO 0.5, Sony&xRhino-Linux