After doing a DIY install creation of Mountain Lion from Disk Utility on a USB stick, I rebooted... While rebooting i pulled flash drive out..... However, the USB is not dead, as i can read it fine from OS X.. it just doesn't show up in the Mult-boot screen at boot... Trying to see why its not showing up,,,weather it was pulling it out without Ejecting it first.. or the fact i didn't create bootable flash drive.... But what makes me think its a flash drive issue, is when i plug in the usb flash after seeing my drive on the multi-boot screen, the macbook halts... That is,, the pointer freezes and unable to move, until i unplug, or power off. Also, if i leave the flash connected while power on, i do not see the Apple logo,, ever..... just a grey screen... even if i wait a long time. This all leads me to the unplugging as it all started go go 'iffy' afterwards. Recommendations?