1. I read that some people reported the power interfering with the card (try booting from battery or AC)
2. I read some people saying that putting the computer to sleep and restoring makes Atheros work (weird)
3. Some people reported problems with Atheros card and UEFI installations (just FYI, I use legacy BIOS mode because I switched my drive from an older laptop that broke)
A few things you could also try:
1. I read that some people reported the power interfering with the card (try booting from battery or AC)
2. I read some people saying that putting the computer to sleep and restoring makes Atheros work (weird)
3. Some people reported problems with Atheros card and UEFI installations (just FYI, I use legacy BIOS mode because I switched my drive from an older laptop that broke)