House Electrical Problem?

7 yr old home. Recently discovered sporadic circuits out in house. Several (10) receptacles out, GFCI receptacles (5) out--no power to outlets, upstairs bath lighting/receptacles all out, all garage power out, basement lighting & smoke alarms not working, no breakers are tripped. Tried resetting all GFCI test... show more 7 yr old home. Recently discovered sporadic circuits out in house. Several (10) receptacles out, GFCI receptacles (5) out--no power to outlets, upstairs bath lighting/receptacles all out, all garage power out, basement lighting & smoke alarms not working, no breakers are tripped. Tried resetting all GFCI test buttons--no change. Tested for voltage at "in-op" outlets--no power coming in. Can turn on dryer or range (any 220v device) & power is restored to all circuits but only at 1/2 power (lighting is real dim, not enough power to energize the garage opener, etc...). I found one GFCI outlet that has power to it but will not trip if the test button is pressed. I replaced this outlet with same type & wired correctly to no avail. I'ved pulled all the receptacles that are non functioning for wiring inspection & can see no defects. Removed the service panel & checked the circuits in question & have power going to breaker. Have any other suggestions I could rule out? Any help would be great!
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