Can't turn on power to desktop

Assuming you mean the 'BIOS Password', turn off & UNPLUG the power cable. Then open the case, find the little silver battery 'coin cell' battery (type CR2032) = on the moherboard, make a note which way round it is & and remove it for a coiple of miniutes.
After putting it back in, when you next power up, you will have to eneter the current time & date into the BIOS..

Assuming you mean the 'BIOS Password', turn off & UNPLUG the power cable. Then open the case, find the little silver battery 'coin cell' battery (type CR2032) = on the moherboard, make a note which way round it is & and remove it for a coiple of miniutes.
After putting it back in, when you next power up, you will have to eneter the current time & date into the BIOS..

Try connecting power adapters through a power strip.

check if any capacitors on the main board are swollen or brown stuff on them.

Replace the jumper back into it's original position. Remove the power cable & hold down the power button for 15 seconds to reset the board. replace the power cable & attempt to boot.

check your power cords, check your outlets, check your surge protector, check the switch on the back of the pc. there may be a black toggle switch with a circle and a line, make sure it's flipped to the line side. if all that is normal, unplug the cord from the computer and open up the case. look at all your power plugs and make sure they're all secure, try and reseat the 1 or 2 main plugs, there should be a rectangular 12 pin plug and maybe a 4 pin plug. unplug them and then plug them back in. put the case back together plug it in, and give it a go. if still nothing then you have to troubleshoot whether the power supply is junk or if your motherboard died. we'll move on to that if it comes up. good luck!

If you need further help, reach me via phone at https://www.6ya.com/expert/joel_63c670a84e9f6a97

There should be 2 rows of pins in parallel usually around the bottom edge of the motherboard. The markings for which is which should be next to them on the board. HDled+, HdLed-, PwrSw, PwrLed, or something similar.

If you do find them but the hard drive Led does'nt come on it's because the plug for it needs to be turned around the opposite way, Led's only work one way as they are diodes. Same for the Power Led.

If there are no letters near the pins then you would have to find the motherboard manual.

test power suply or prosesor

Hi.

Sounds more like a power supply problem. First test the on/off switch by tracing the wires to where it connects to the mother board. The plug is usually marked "pwr sw" . Unplug the wire from the board & short out the 2 pins where the switch was plugged in using a small screw driver or any other conductive material. If the pc still fails to turn on, try replacing the power supply.
Best wishes,
Graemevm