Dvd-r's work perfectly on my macbook but some dont work on a PC and an imac

i've burned 5 dvd-r's (using idvd) over the past few weeks, checking them all on my macbook before taking them to work for presentations.
2 of the 5 have worked perfectly on the work PC and imacs but 3 have just shown up as blank dvd's on both the imacs and the PC. All work perfectly on my macbook!
Anyone got any ideas why this is happening? And what I can do to prevent it? The first week was a nightmare but i managed to make the presentation work anyway, this week, luckily the majority of video was on the disk that worked but another disk was just seen as blank by the PC and imac..
Next week, I'll be taking all the video elements of the presentation on a hard drive as well but its not ideal... Any ideas??

i dont think its either of those though...
The media is from the same batch i've been using for a while (and TY dye so not cheap) and two of the five i made worked perfectly in these computers.
It wasn't just the PC either. An iMac wouldnt recognise them either.
My macbook still plays them all fine.
Could it be the dvd burner in my macbook is not compatible with newer machines? My macbook is from mid 2008 and the iMac I tried it on are newer than that.
I'm also wondering if my macbook burner has a dirty lens? If it does, could that cause these problems??
Thanks for getting back to me!

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