Turn it on by pressing start and eject at the same time. LED on the external switch should initially turn purple, then blue, and you should see the Flashbios screen again.
Make sure your switches are set to on-on-off-off-off (flash the first 1M bank), and make sure you're not accidentally using the 3294 v1.6 BIOS. Try the flash again, but this time watch the flashbios screen instead of switching over and watching TV!! At least that way if there's a problem you'll see the error message!