Suddenly, one room in my house has no power. I have checked all the breakers, and none of them are tripped. Any ideas?

Is it on a GFCI circuit? You may need to find an outlet that has been tripped and hit the reset button.

Nope, no gfci in the house, I don't think they did that in the '80s. And I haven't gotten around to replacing outlets yet. I'm stumped on this one.

Could very well be aluminum wiring & an open circuit. Gonna have to trace this one from the breaker box - the open might be at the box or at the first outlet in the room.

It seems like I have copper wire throughout, or at least its copper at all the fixtures and outlets. Bedrooms 2 and 3 share a breaker and bedroom
2 has power everywhere except the outlet on the wall that it shares with bedroom 3. I guess to trace it further, I will have to go to the attic. I was really hoping to avoid digging through all that insulation.

Find the leader -- usually there "should" be no more than twelve receptacles to a 20A circuit -

Your lighting should be on 15A breakers

Hopefully your breaker box was marked --

You can use a circuit tester to follow wiring that is powered , most likely you lost a neutral leg as this is commonly wire nutted -

I would suspect that you have a loose connection in an outlet box that is feeding the bedroom. I would check each outlet in the area with a non contact voltage tester. The first dead one I found I would open it up and examine it. This is a common problem with "back stabbed" receptacles. I usually is the white (neutral) that is loose. Most often the wires can be re landed on the terminal screws and the problem will clear up. If the wires can easily be pulled form the back of the receptacle the fault usually lies there.

now thats some solid advice from a profesional

Old Town, I have a wire i want to check inside a wall,what is a no contact tester?
Do you point it in the area of the wire & look for voltage?
This leads to my heater.

Fluke makes a voltage tester that just has to be close to the current. Not sure how well it will work through drywall though. Works great for checking Christmas lights.

Well, I didn't have a non contact tester, so I pulled all five of the non working outlets and the light switch. All connections looked good. The only thing I haven't checked is the connections at the ceiling fan, and the stuff in the attic. I may have to call in a professional on this one.

First off your ceiling fan shouldn't be on your wall outlet circuit, some older homes did not have ceiling lights and relied on switched outlets (as in the wall switch)-- you can go to Lowes , Home Depot and purchase a non contact wire tester, which will determine where power STOPS - fluke or greenlee are fine, around $20 and usually it has to be within 1/2" of hot wire to indicate power - handy dandy gadget to have around - you need to find where your home run to the breaker for that room is and work from first powered outlet on till you find the problem -- as said its probably a loss of neutral.

You could also have a bad breaker or a wire may have come loose in the breaker box. I would check all three wires in the breaker box and change out the breaker, They are cheap, probably $5 or less. Easy check before you start digging through insulation.

But did you actually try to tighten the connections. They can look good but may still be just a little loose. Had a similar thing happen to me. All looked OK but one of them was just a little loose. Tightened one only a quarter turn and all was fixed.

yeah, all the outlets are connected at the rear as opposed to being screwed on the posts. i ended up replacing all five of the non working ones. still no power. i know it's not the breaker, as two rooms share the breaker and one has power except to one outlet.

here is a quick sketch of what i'm looking at:

May have dropped a leg of power. Any 220V issues?

Squirel or rat chew partially through a wire in the attic?