[Q] Reboot problem with memory card, no problem w/o memory card

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Here's my issue.

I have a myTouch4G, rooted, stock OS.

Today my phone started into a boot loop and I couldn't get it to stop. I tried a battery pull, still no luck. Ran a "Fix Permissions", still no luck. After I pulled the memory card it stabilized, no reboots. When I put the card back in, the reboots starts up again. So I thought it was a faulty sd card....so I moved all the contents to another sd card....same problem. So to be sure I wiped a sd card, inserted it....no reboots. So I'm convinced it has something to do with what is on the memory card, I just can't figure out what. I tried searching for what files were updated/modfied through windows explorer but I didn't find much....

Please help!

Thanks