For any computer a 200watt power supply is too small, I would replace that no matter what. For the low sound problem make sure to check all of your volume levels, there are hidden ones that are only found once you open your volume control and go to "options" then "properties" and check all of the boxes available. I always turn all of the levels all the way up and adjust using master volume and the speaker volume.
I also have had these types of issues when sound cards were upgraded from onboard sound cards, most of the speakers provided were not amplified, so try out different speakers.
make sure you are using all of the latest versions of everything. even though you may have your antivirus doing an automatic update, it is only updating your definitions and not your program updates, make sure you are fully updated on the windows side too, I run windows update once a week, and always find new stuff, once again the auto update only downloads the critical stuff not the program stuff.
You listed the model of your PC not your printer, I would assume that you have a USB printer, I would try unplugging the printer, and turning the computer on with it unplugged, once it is fully booted up, plug in the printer.
I also have had these types of issues when sound cards were upgraded from onboard sound cards, most of the speakers provided were not amplified, so try out different speakers.
make sure you are using all of the latest versions of everything. even though you may have your antivirus doing an automatic update, it is only updating your definitions and not your program updates, make sure you are fully updated on the windows side too, I run windows update once a week, and always find new stuff, once again the auto update only downloads the critical stuff not the program stuff.
You listed the model of your PC not your printer, I would assume that you have a USB printer, I would try unplugging the printer, and turning the computer on with it unplugged, once it is fully booted up, plug in the printer.