Computer not starting, USB mouse blinking

[Tsquared10]

So my computer shut itself off at some point last night and won't turn back on. The only sign of power to the computer is the light on my USB mouse blinking once per second. I'm fairly new to building a PC but it had been running fine for the past two months up until past night. The socket works with anything else plugged in there. I can provide more details if necessary, friend said I might've blown out my power supply, figured I'd get a second opinion before I sink more money into it if it'd not necessary.

 

[TechHelpNO]

So my computer shut itself off at some point last night and won't turn back on. The only sign of power to the computer is the light on my USB mouse blinking once per second. I'm fairly new to building a PC but it had been running fine for the past two months up until past night. The socket works with anything else plugged in there. I can provide more details if necessary, friend said I might've blown out my power supply, figured I'd get a second opinion before I sink more money into it if it'd not necessary.

I dont think its the PSU because you get mouse blinking. Do you have any other power reading like fan spinning or LED light of case (if you have any) or anything ?