Cisco 2811 Router will not load image from flash

I have a Cisco 2811 at a client site that will not boot.  I powered down to work on the UPS and when I powered the router back up I get this error message on boot up&

Error : compressed image checksum is incorrect 0xAAF13B7D
        Expected a checksum of 0x39AC9B1D

*** System received a Software forced crash ***

It brings me to a rommon 1 > prompt.

I have tried booting from the IOS image of the flash but no go.

Any ideas for me???
ccsonlineAsked:
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that1guy15Commented:
It looks like your IOS image has gone currupt. This could have happened because of a memmory issue or just bad luck. Here is a doc on how to troubleshoot a software forced crash to see what is going on.
http://www.cisco.com/warp/public/122/crashes_swforced_troubleshoot.html

You might just need to reload a new IOS. Here is a doc on reloading your IOS from ROMMON

http://www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186a008015bf9e.shtml

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