We have an assortment of outlets that aren't working, some labelled GFI, some not. Dave replaced the GFI outlet in the bathroom, but there is still no power. Outlets in kitchen work, outlets in living room don't. Fuses all look OK. Breakers have been flipped off then on. Any suggestions? Dave doesn't have a tester with him, so we can't check the breaker labelled GFI......