Internal and External DVD players keep ejecting DVDs

i have a G4 500mhz AGP mac (upgraded to a 1.6ghz processor via a NewerTech card) with an internal CD/DVD player (not burner) and i have an external LaCie CD/DVD burner (the LaCie CD/DVD burner is only about 4 weeks old and i've burned maybe 8 to 10 DVDs on it)
i have had NO problem reading any DVD disks until just about a week ago.. i had bought a new Graphics DVD and it worked the first time i put it in the DVD player... the second time it would not work... (((this was the start of the problem of the purple-ish DVDs not mounting))) so, i thought i had just bought a faulty DVD, they replaced it and the new one still will not work at all.. the DVD will NOT work in my internal DVD player AND it will not work in my LaCie external DVD burner/player...
the internal drive just spins for a few minutes and the kicks the DVD out... the external LaCie drive spins for several minutes, then i finally get a message saying the disc is not readable.
what i have noticed is that any DVDs i put in will mount as long as they have a silver surface.... if the surface is purple-ish color, those are the DVDs that will not mount and keep ejecting
even DVDs that i have burned on the external LaCie DVD burner will not mount in the internal drive OR the external drive...
as i said, all of the DVDs that will NOT mount are the one's with a purple-ish surface... maybe that has something to do with the problem....
something must have happened somewhere because these purple-ish DVDs did used to work... i even did a brand new install of OS X.4 on a totally seperate hard drive and these purple-ish DVDs STILL would not work...
even booted into MacOS 9.2.2 and the STILL would NOT mount....
ANY info would be helpful...

i now KNOW that there is NOT a defect with the LaCie DVD/CD burner and there is not a problem with the purple-ish DVDs, but it is HAS TO BE something with the Mac or MacOS X software because i took the LaCie drive and connected it to my WindowsXP machine and ALL the purple-ish DVDs that would not mount on my mac computer WILL WORK on with the LaCie drive connected to my XP machine...
any suggestions are appreciated.....

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