If you have not already done so, I would suggest changing the CMOS backup battery - note that I needed to reboot the MC200 without any battery in place and then - very carefully - replace the battery with the power still connected. Prior to starting in this manner, my MC200 hung with a flashing light as per your description even with a new battery in place.
The issue may not be the back-up battery, however, disconnecting as above would at least eliminate one variable.
John
808v6, M60, MC200, HD621, Lumagen XE, 504, SB Touch, 563, 201, 204, 208, MPMAX 221, M80, Explorer, Explorer2.
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