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1) Go back to the switch box and double check for loose wire nut splices or loose back-stab inserts.
2) Do you have a multi-meter to confirm voltages at the dead receptacles?
1) Is the tester a 2 wire lead (contact type) or a non-contact tester?
2) It is very common that a bedroom has at least 1 switched receptacle.
1) The right side switch should not contain a black jumper wire as that will create a short circuit.
2) You need either a 2 wire lead AC voltage tester (a contact type) or multimeter to check the voltages. A 3 prong cube tester is not sufficient.
1) Once you get a tester or a meter, take voltage measurements at a few of the dead receptacle. Most likely, there will be an open hot wire on the circuit. See diagram shown below:
1) A single pole switch which contains 2 screws has 1 hot wire terminated to 1 screw and the switched loop wire terminated to the 2nd screw. there is never a jumper in between the 2 screws on a single pole switch.
1) A regular single pole ON/OFF snap switch never contains a jumper wire from screw to screw. There is no purpose. The jumper can cause a direct short circuit. Was obviously not wired correctly.
2) You have either an open or loose hot or an open or loose neutral wire somewhere. Most likely an open hot wire at the switch box would be my guess. A meter can easily confirm this.
Whenever performing electrical work, a meter is a must have testing instrument. Without a meter, it becomes a guessing game. Get a meter and we can continue.
3) Jumpers are only used as a pigtail to splice a hot wire to another hot wire. They are not used to tie the 2 switch screws together. A single pole switch requires 1 hot circuit feed and 1 switched loop and they are never jumpered together.
1) A pigtail wire is also used to provide for 1 circuit feed hot into the switch box, and then sending each hot to 2 separate single pole switches.
1) We are wasting time by guessing.
2) Make a Home Depot run and purchase a multimeter for $25 or less or borrow a meter from a friend or a neighbor. You need to confirm which wire in the wall box is the hot wire and you also need the meter to confirm if the receptacles have an open hot or an open neutral.