At this point I'd just pull an extension cord from a room that doesn't have this problem.
Exactly, run a cord from an outlet in a room where it works to the bedroom. If it then works as it should, with all the stuff set up and plugged in as it is
(exactly the same with all connections of the devices, cables and so on, change nothing), compared with when it doesn't work with the stuff plugged into the bedroom sockets in the bedroom, then the fault can reasonably only lie in the sockets in the bedroom. Or?
This is something you can try right now. Probably the easiest way to troubleshoot.
If that is the case, I stand by what I said earlier: Talk to an electrician (if you do not have the necessary knowledge of electricity yourself).