Cisco 3640A: GT64010 Master Write Parity Error

I have booting problem with a Cisco 3640A router. Everytime I try to start it it gives me following error and keep restarting.

============================================================= System Bootstrap, Version 12.1(17r) [cmong 17r], RELEASE SOFTWARE (fc1) Copyright (c) 2002 by cisco Systems, Inc.

*** GT64010 Master Write Parity Error *** PC = 0xbfc1e930, Cause = 0x4000, Status Reg = 0x3041f003 Failure detected during ROMMON start-up tests. Restart ROMMON.

System Bootstrap, Version 12.1(17r) [cmong 17r], RELEASE SOFTWARE (fc1) Copyright (c) 2002 by cisco Systems, Inc.

*** GT64010 Master Write Parity Error *** PC = 0xbfc1e930, Cause = 0x4000, Status Reg = 0x3041f003 Failure detected during ROMMON start-up tests. Restart ROMMON. ==================================================================

The router has two slots for PCMCIA card but I don't have any PCMCIA Flash memory niether the router has any interface installed yet.

I need help.

~/Dev