Does the power on/off switch on a computer actually turn off the power supply or is a small current still running? - Quora
![A computer tower needing an external power supply. There is nothing behind the power supply "cutout". Basically a laptop motherboard in a case. Also, the card slots aren't removable. : r/techsupportgore A computer tower needing an external power supply. There is nothing behind the power supply "cutout". Basically a laptop motherboard in a case. Also, the card slots aren't removable. : r/techsupportgore](https://i.redd.it/lbrgeb5r4su51.jpg)
A computer tower needing an external power supply. There is nothing behind the power supply "cutout". Basically a laptop motherboard in a case. Also, the card slots aren't removable. : r/techsupportgore
![Amazon.com: PC PSU DC 12V Input 300W Output Computer Power Supply Module Board with 24Pin Connect/AUX/SATA Cable, Suitable for MiniITX and 1U Case : Electronics Amazon.com: PC PSU DC 12V Input 300W Output Computer Power Supply Module Board with 24Pin Connect/AUX/SATA Cable, Suitable for MiniITX and 1U Case : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/61n1oqdh5dL.jpg)