Cisco1721 error

[rotaman]

I'm getting these errors on a cisco1721 at bootup:


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System Bootstrap, Version 12.2(7r)XM1, RELEASE SOFTWARE (fc1)
TAC Support:

http://www.cisco.com/tac

Copyright (c) 2001 by cisco Systems, Inc.

*** Warning during size main memory test,
expected bus error does not occur above -2048 mb of main memory

*** Machine Check Exception ***
PC = 0xfff1451c, Vector = 0x200, SP = 0xff002620

System Bootstrap, Version 12.2(7r)XM1, RELEASE SOFTWARE (fc1)
TAC Support:

http://www.cisco.com/tac

Copyright (c) 2001 by cisco Systems, Inc.

*** Undefined Exception ***
PC = 0xfff00000, Vector = 0xfff00000, SP = 0xff002918

System Bootstrap, Version 12.2(7r)XM1, RELEASE SOFTWARE (fc1)
TAC Support:

http://www.cisco.com/tac

Copyright (c) 2001 by cisco Systems, Inc.
environment checksum failed

System Bootstrap, Version 12.2(7r)XM1, RELEASE SOFTWARE (fc1)
TAC Support:

http://www.cisco.com/tac

Copyright (c) 2001 by cisco Systems, Inc.
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I've been looking around for these error messages, nothing on the cisco site, and not much out there about it. Any help would be appreciated.