Hi,
Sorry for the delay.
If something went wrong while you were trying to flash the bios, that's usually bad news although it's not clear if it really even started the bios flash procedure (which may have happened on the Windows restart)?
Anyway, try to get into the bios by tapping the 'delete' or 'F2' key as soon as you power on and maybe connect an external monitor if available to try to get a display (Fn+F8 may switch the displays if necessary), but don't have a lot of hope for this and it's very bad news for the hardware if you cannot even get into the bios anymore (which may indicate something really did happen to the bios somehow).
If you're not even able to get into the bios, this idea may not work, but try holding the 'ctrl' and 'home' keys while you power on the unit to see if it will start the bios recovery/re-flash procedure which will look for the bios file from your C: drive that is included as part of the ASUS Windows image for models that support this feature.
If you can't get better ideas or a solution though, you may want to start consider sending it back to ASUS for repair especially if you are still under warranty, otherwise, you might need to decide if you want to pay for out-of-warranty service.
http://www.asus.com/support/callusIf you didn't already know, you should be able to remove your hard drive and transfer the data to another computer using a USB hard drive housing, so something you may want to look into or find a repair shop to help with.
Good luck!