It looks as though you have deleted the system IOS image on the CF - this would have been done when you formatted the Flash using the format flash command.
As there is no IOS image on the router it is booting straight to Rommon mode. You can recover from this provided that you have a backup of the ios image on your computer. You will need to setup you computer as a tftp server (download TFTP32 - a free tftp server software deamon for windows) - place the IOS of your router in the TFTP root directory of TFTP32. Connect your pc to the 2911 using a crossover ethernet cable.
Set your computers lan interface to a fixed ip address (say 10.0.0.1/24), then from the Rommon of the router carry out the following commands =
rommon 16 > IP_ADDRESS=10.0.0.254
rommon 17 > IP_SUBNET_MASK=255.255.255.0
rommon 18 > DEFAULT_GATEWAY=10.0.0.254
rommon 19 > TFTP_SERVER=10.0.0.1
rommon 20 > TFTP_FILE= type in full file name of your IOS here (inc .bin extension)
rommon 21 > tftpdnld
provided that you have full connectivity then you should see the file start to go across from your computer to the router.
when complete issue the reload command, then once loaded you can change the config register from within the ios (0x2142), reload again, and hopefully your original config should be their ready and waiting.
good luck, if you have any more problems post here and we will try and trouble-shoot it together.
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