External HD causing Picture/Video Quality Problems

(cross posted in Quicktime) -
Hey everyone, I have been having video issues on Quicktime and they (unfortunately) correspond to two different recent changes. One is my purchase of an external HD (Western Digital Passport 120Gig) and the second is the upgrade of Quicktime. I don't know exactly where to post this question, but I'll post it here as the issue only occurs with videos. In essence, the problem is that the videos become intensely pixelated when playing off of the external HD, and the videos which have been on my system appear to have been affected but clearly not to the degree of those which I transferred off of the system.
If I am not mistaken, videos which I have put on my system after the last time I had the external HD connected seem to be fine. This is why my concern is that the issue is with the external HD. The HD requires a Y-USB connector which I bought separate from the HD itself. Anyway, the issues with the videos on the HD are really severe, and the problems with those on my internal HD are certainly noticeable. Is this just a matter of needing to get the USB cable from Western Digital (the Western Digital website recommends purchasing the Y-USB cable from them, but I bought it at RadioShack)? Is it unfixable? Is it something else that I am not noticing? Any help would be appreciated. Thanks!

Just for clarification, you bought a WD passport and need to use the Y-USB cable to connect to your Macbook Pro? I'm a bit confused, but isn't that cable only needed when a USB port can't put out enough power to the drive from the computer?
I ask because I have a Macbook Pro and a WD passport and I don't need a special cable to connect to it. I just plug it in with the regular USB cable that came with it. This is a wild crazy guess (and probably not true), but perhaps that may be a problem with your issue?

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Quote
Originally posted by Raven_
hi
its possible to use an ps/2 mouse AND a usb mouse at the same time.
i used the ps/2 mouse in windows and the usb mouse when playing games.
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i was in windows surfing and the pointer just jumped all over the screen.
when i looked on the other side under a table a friends little kid played with the usn mouse. )
bye
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