TS1440 Air won't boot (flashing folder question mark); tried all the steps

I've read and tried all of the fixes in ts1440 and ts2570 and hit blocks in all cases. Anybody got any more ideas before I schlep my Air to an Apple store?
MacBook Air, 10 months old, running Mountain Lion
It restarts to a flashing folder with question mark.
If I hold down the <option> key, it gives me the option of booting off the internet (takes forever) and then I can use the Disk Utility, etc. The DU Verify Disk says there is no problem with my drive. However, the Startup Disk tool doesn't list the computer hardrive (or anything else) to boot off of.
In the utility I tried the option to reinstall Mountain Lion but it gives me an error message, saying I should call Applecare.
I plug in my Time Machine backup USB disk drive but the utility has the Continue button grayed out for the option Restore from TM.
I've tried rebooting with option-command-P-R to reset the PVRAM, and rebooting holding down the shift key (safe mode).
I don't have physical copies of the OS, I think its all from the cloud/AppStore. I've got a couple other Macs around (mini, macbook) but I don't think I have a compatible cable (without buying a doggle). I always use wifi with the Air.
Thanks for any suggestions.

It restarts to a flashing folder with question mark.
If I hold
down the <option> key, it gives me the option of booting off the
internet (takes forever) and then I can use the Disk Utility, etc.
The
DU Verify Disk says there is no problem with my drive.
However, the
Startup Disk tool doesn't list the computer hard drive (or anything else)
to boot off of.
Since you have TimeMachine you can opt to use Internet Recovery to erase/format the entire drive and restore from that.
1 partition, option: GUID, format: OS X extended journaled in Disk Utility.
If it doesn't work to restore, then take it into Apple as you have a one year warranty, Buy AppleCare.
Also a solo TimeMachine drive isn't the best,
Most commonly used backup methods

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