My latest project requires a 90 degree power connection cord.
I happened to have one on hand. A cheap short extension actually, with a 90 degree male plug on one end and a straight female on the other end.
Im using an old arcade cabinet power supply, so I cut the cord in half and hooked red to PS+ and black to PS GND.
Before I hooked it up I double checked the voltage on the power supply and it is dead on 5 volts.
So I went ahead and connected my red and black wires from the male end and plugged the male end into the Pi.
I powered it up and the Pi did not come on. Oh no!
Unplugged everything and double checked my connections, all looked good. Tried again, RPi silent as a church mouse.
So I unplugged my cable and plugged in a regular wall wart made for the Pi.
Still no go.
Im starting to get edgy now.
I took the cut off female part of the cable and plugged the male end into the female end.
Checked the voltage on the red and black wires on the female end. Nothing.
Tried plugging female end into the wall wart. Nothing on red and black.
Something in my feeble mind was saying check the other wires. (It finally got loud enough to drown out the self abuse I was thinking.)
I found this: White wire is +5 and red wire is - or ground. WTF?
I thought all usb cables wire red positive 5 vdc and black ground???
Cheap Chinese ripoffs!
Now I face the realization that i may have fried my Pi.
I read online that the onboard fuse will most likely reset itself after a few hours, or days. Its been an hour and still no go.
So I got to start thinking about a replacement Pi.
Moral to this long story: Always double check before applying the juice. Dont take anything for granted.
If I had plugged the male end into the female end and checked voltages first, I may have saved a big headache. (And cost of a new Pi)
You live you learn I guess. Now wheres the Tylenol?