Hp pavilion laptop will not boot up.

 I get this error The file header checksum does not match the computed checksum. I'm not able to do anything with it after this screen, it will not boot to safe. What can I do?
I've removed the battery, which is dead anyway; laptop is plugged in.  Have tried different power source and that doesn't help.
There  is no blinking cursor, etc. I have tried F2 & ran that memory & hard disk diagnosis & nothing seems to be amiss. On the error log I really didn't see any errors.
I don't have recovery disc either but laptop won't boot to cd rom drive so even if I had recovery disc am not sure that would work.
Help please I'm at a loss now of what to do.  Thanks.

Does F11 at power on work to boot into Recovery?
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01867418&cc=us&dlc=en&lc=en&jumpid=reg_r1002_us...
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