Isn't the power supply supposed to show any sign of life when the power switch on the supply itself is turned on? - Quora
![motherboard - How did HP made their power on bottom work with no VSB (standby) on their pro 290 and to make a 24pin ATX psu work with it? - Super User motherboard - How did HP made their power on bottom work with no VSB (standby) on their pro 290 and to make a 24pin ATX psu work with it? - Super User](https://i.stack.imgur.com/cb3lr.png)
motherboard - How did HP made their power on bottom work with no VSB (standby) on their pro 290 and to make a 24pin ATX psu work with it? - Super User
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