It takes a good 5 to 10 minutes for the system to boot up with the music on my SD card, 450 songs. I have the file in a folder labeled MP3. This wouldn't be an issue but this also prevents the unit from bringing up any maps. If the card is not in boot up is quick.
Are you sure none of these files is corrupt? My best results were with fixed bit rate 128 bit MP3's and I had 4 gigs of them on an sd card. There have been issues with MP3's, maybe you need a firmware update, use the Garmin webupdater here http://www8.garmin.com/products/webupdater/howtoinstall.jsp
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