My PC, Audio system and the router keep restarting

[Nanotechnix]

So yeah, as the title said, they just keep restarting. At first I thought it was the PC, then I noticed that my Audio system which I use as a speaker system is off as well, and when the PC boots up, there is no internet for a few minutes. I have no idea what it could be, any ideas?

 

[popatim]

If its the power that keeps causing these to restart then check that they are not plugged into an outlet strip that has automatic switching.
Some outlet strips have an outlet that when a load is detected on that outlet then it turns on several other outlets. This might be fine for the audio system but the modem/router should be on one of the unswitched outlets so that its always on.