I have 2841 router but unfortunately when turn on router ,prompt goes to romon mode.After changing confreg 0x2102 & rebooting the router ,router does not come to normal.Show flash' does not contain any output on the flash.Please help me by a document.
According to the output you have posted here, the router does not even recognize the Compact Flash (CF) card.
Have you already tried to remove and reinsert the CF card? Sometimes they get loose and just a couple of disconnected pins can cause this problem.
If this does not help, do you have any other 2841 router with a similar CF card? If yes, try swapping the CF cards to see if the other card works in your router.
It can also be that your CF card is faulty. It has happened to me before and in fact there was a series of faulty CF cards that required replacement. It was documented in Cisco Field Notice document here:
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