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first - check the power supply if it's really giving power.
Get voltmeter or plug it to something else you know it's working.
If you are sure it does and still nothing, you need to check the fuse inside the P80. I've been there, it's not so hard to open it
(from below of course)
BTW, it's advisable to user surge protector on such delicate devices like computers and keyboards if there are any fuses that have blown. I can't tell you how many times a blown fuse has stopped equipment from working. I had a blown fuse go in a microwave oven a few years back. I called a repair guy while on a job to fix my Leslie (many years ago) and the culprit, a blown fuse. I could have fied it myself if I had given it more thought.
Check the internal fuses first and you might save some money and a trip to a repair center. , sometimes a fuse can look good even when it is blown. If you have a voltage tester do a continuity check on the fuse just to be certain.It's possible that the P80 does not use internal fuses especially since it uses an external 12 volt power pack There might be info on the fuse in the P80 manual. Otherwise try Yamaha support. A lot of low volage gear run of AC adaptors is unfused.
Another possibility is that the power connector or switch on the P80 is broken. DC power jacks are liable to get broken solder joints due to movement, especially if they are circuit board mounted and not chassis mounted. If you know what you are doing test the connector and switch with a multimeter.
If they are good then also check the wires from the switch to the main board. They a probably connected with a plug, which itself can come lose.
You can test for bad connections with the power off. Only test with the power on if you really do know what you are doing! You won't electrocute yourself but you can easily damage the keyboard if you are not careful.
Unless you are experienced in electronics repair that is as far as you should go.
Of course I can't be sure but most amps don't have fuses on the circuit boards anymore. They use protect circuits, they may have blown your amp and yes it could be expensive. Are there indicators on the front panel? LEDs on that shouldn't be?
I will answer this assuming you have connected the inputs and outputs of both the pedals AND the amplifier/guitar properly. Double-check your connections! ;)
Otherwise...Have you checked all the patch cables to make sure they're ALL working properly? That's usually the culprit in a situation like this, all other things being equal. Cables take the majority of abuse in your signal chain and also happen to be the weak link in the signal chain as well. It only takes one bad patch cable in a series to interrupt the signal.
I would take a pedal with perfectly functioning inputs and outputs and use it to test each cable yer using. If you verify all the cables are in fact working properly (and you are 100% certain everything is connected correctly), that indicates there might be an issue with the pedalboard's onboard electronics. At the most simple, the "From Guitar" or the "To Pedal" or the "To Amplifier Input" jack might be bad. One or more them, in fact, but it only takes one to entirely interrupt that signal chain. The loop section is less straight-forward in that if one of the loops has a bad input or output jack, that shouldn't affect the overall signal chain, nor the inclusion of the other pedals in said signal chain.
So, I think it's one of three things:
1. The pedals, guitar, or amplifier are not properly connected;
2. You have a bad patch cable;
3. Something has gone wrong with the electronics onboard the pedalboard, and this will probably require service.