Hi Every one

I have a Pioneer DV 355 ...It has been a great little unit until today ...I normaly play R4 discs in PAL format I have played discs in NTSC format in the past with no worries at all ...but today it started to play them in BW sound is normal ect ..I have reset the unit but it made no diff. Has anyone had this Prob. before and knows how to fix it plaese let me know

thanks M.