Readynass 3138 wont boot

Hi everyone,
I had a power outage a few days ago, and since then, my ReadyNAS 3138 won't boot.

The first drive shows no lights. The second shows a green and red light, the third a solid green, and the fourth just a red light.
On the panel, only the network light comes on when I turn on the drive, but then it turns off.
When I turn it on, it stays on for a few minutes and then reboots.

I tried entering the boot menu, but it doesn't respond to commands (i.e., no lights come on). I tried reinstalling the OS with a front USB drive, but it doesn't seem to do anything.