PBP won't power. Charge light solid orange/red but turns off.
Okay, this really sounds to me like U-boot runs, and hands over control to the operating system, which crashes early.
Lets leave the eMMC turned off for now.
1) What operating system image are you trying to boot from Micro SD?
2) Have you tried a different Micro SD card?
3) How are you writing the image to the SD card?
4) Do you have a UART cable (beware there are "right" looking cables which can cause damage)?
I highly recommend the original PBP operating system image, "Debian Desktop" which can be found in the wiki, for these situations It seems to be the most likely to work in these situations. There have been many reports of SD cards that do not work properly, even a few reports of SD cards that once worked, which now do not. I only ever write SD cards with `dd`. I am not familiar with other methods, but many people report having other preferences.
It may sound ridiculous, but it is pretty common to have a buggered eMMC and an SD card that won't boot, at the same time. Usually after trying relentlessly, the PBP will just suddenly work with a particular SD card; and then you can rewrite the eMMC and get back to normal business. I hope this is your case.
If you should have a UART cable, and a way to use the serial console, this may give you more insight to what's actually happening.
Lets leave the eMMC turned off for now.
1) What operating system image are you trying to boot from Micro SD?
2) Have you tried a different Micro SD card?
3) How are you writing the image to the SD card?
4) Do you have a UART cable (beware there are "right" looking cables which can cause damage)?
I highly recommend the original PBP operating system image, "Debian Desktop" which can be found in the wiki, for these situations It seems to be the most likely to work in these situations. There have been many reports of SD cards that do not work properly, even a few reports of SD cards that once worked, which now do not. I only ever write SD cards with `dd`. I am not familiar with other methods, but many people report having other preferences.
It may sound ridiculous, but it is pretty common to have a buggered eMMC and an SD card that won't boot, at the same time. Usually after trying relentlessly, the PBP will just suddenly work with a particular SD card; and then you can rewrite the eMMC and get back to normal business. I hope this is your case.
If you should have a UART cable, and a way to use the serial console, this may give you more insight to what's actually happening.