I run Snowleopard on my MBA. One day is all worked smoothly ,the other day I got the instructions to press down the power button and to retry to start. But it doesnt start. Today I only see the apple logo and the rond ongoing circle. Apple person suggested to reboot via superdrive.(SD) Connected the SD trried to insert the disk but it wont "swallow" the disk as it normally does. Now what ? Any suggestions ???