sounds like a conflict between a serial type connection (printer, scanner, etc) and the modem. It can happen where it will not have any splats or exclamation points, but when running diagnostics it will say modem not responding. Try going into modem, highlight the com port its on and remove it, then go into DM, if modem is there, remove it, as well as all com ports and restart. hopefully it should redetect it.
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