Brief Background: Within the past year or so I was having some common battery/charging problems. I was suffering from "Plugged In, Not Charging". According to the usual checks, the Power Supply appeared to be working properly. I replaced the battery with a replacement model from Amazon - NOT a Dell OEM battery because of the high price. It immediately charged to 100% and worked normally for about a year. Then the error message started again, "Plugged In, Not Charging." During that entire period, the BIOS stated "Battery Not Recognized" AND "Power Supply Not Recognized", even though both were working for awhile. After much trying solutions, I gave up and bought both a new Dell OEM Battery and new Dell OEM Power Supply/AC Adapter. I uninstalled the old drivers and installed both with new drivers. That's the background.
NOW, the new OEM battery is charging perfectly, up to 100%, and running the machine for many hours, as it should. The desktop memo states, "Plugged In, Charging." So far so good. However, the machine will NOT boot, cold boot, reboot or even wake from sleep mode, while the new AC cord is plugged in. If I unplug it, the machine boots and wakes from sleep normally on the battery, but it just goes to a dark navy blue screen and sits there if I try to start it with the AC cord plugged in. NOTE: It's NOT a BSOD. That's a different blue altogether. AND, it will not get to any state where I can press F2, F8 or F12. None of those work while the AC cord is plugged in.
I ran a repair start, reset to an earlier working state and Dell online diagnostics, but got no helpful results
M6600: Windows 7 Pro, BIOS A15
ANYONE HAVE ANY IDEA WHAT THIS IS?