outlet getting "juice" but won't power lamp
#1

When I added a bedroom in my daylight basement 3 years ago, I installed four outlets on a seperate 15amp circut. All the outlets have worked in the past 3 years, until recently. The last outlet in the line gets "juice" ( so my $10 circut tester says), but it won't power a lamp or vacuum. Whats causing that? How do i fix it?
#3
If these receptacles have two slits and a hole, then buy an $8 receptacle tester. Plug it in and tell us what the lights tell you. But I agree with tex. Most likely you have an open neutral.