I have downloaded and extracted the image:
RuneAudio_rpi2_rp3_0.4-beta_20160321_2GB.img
I have placed the image multiple times on the SD card (Samsung 32 GB EVO), using two different Windows packages:
Win32DiskImager-0.9.5-install
USB Image Tool
For each trial on my brand new Raspberry Pi 3, the power light comes on just fine. The green SD access light then comes on, and goes off a few times as if the boot process is proceeding. Unfortunately I get no rainbow screen on my monitor, and the monitor remains blank. About every three seconds the green LED comes on then goes off immediately.
After re-imaging the SD card a few times with RuneAudio, I installed NOOBS on the very same SD card and the system came up just fine. The only difference between the two configurations is trying to use the RuneAudio image versus the NOOBS installation process.
I found a reference that suggested pressing 1, 2, or 3 on the keyboard to change the graphics display mode. This makes no difference and the screen remains blank. In addition, the disk partition I can see on Windows shows only 17.4 MB as used with 82.3 MB still free. Confirming this, the Disk Management app on Windows shows the primary partition as "100 MB FAT" with a second partition of 2 GB and 27.7 GB as "Unallocated."
To double-check, I did NOOBS again, which continues to work just fine.
Finally, when I return the SD card to my Windows computer, I invariably get an error message "There is a problem with this drive. Scan the drive now and fix it."
I have no idea what to do to try to determine the problem.