I'm using an old power supply unit from an old computer (2011 HIPRO) to power my Raspberry Pi.
I have measured the voltage across the terminals of the 5v output (Red and Black) and have proceeded to hook this up to a USB adapter which goes straight to the Pi.
My problem is that using this PSU the red "on" indicator light does not turn on, versus when I use a USB charger it does.
Was there a problem with this red light not turning on? Is this bad for the Pi?
BTW everything works fine using both power supplies, the Pi turns on and the screen is shown, able to login etc.
Please see my photo of my setup below:
Closer View of the PSU pin outs: