Overnight I had a power outage. My system has a UPS so this shouldn't cause problems, but I don't know how long the outage lasted. My system was unresponsive. I tried powering off and back on and got error 110. I tried shutting the power for 10 minutes but it still won't boot up. The system keeps trying to find a boot drive but I keep getting this error -110.

The system has run fine for several years. The boot drive is a Samsung flash drive that is attached to the USB header on the motherboard. I have not touched anything to do with the boot drive in a long time.

I believe the system is running Unraid 7.2.2

I Googled and there doesn't seem to be much on this topic. I am guess that the issue is that my flash drive is not working.

Edited July 17Jul 17 by wayner

Try recreating the flash drive, first backup the current one, then recreate it using the USB tool, confirm the flash drive boots with the stock install, and if yes, restore only the /config folder from the backup overwriting any existing files, if it still fails, try with a new one.

How do I backup the current flash drive since I can't boot into the Unraid OS? I have a backup that is from Nov 2025, and I haven't changed much on the system since then. So I am happy to restore this.

Should I try to recreate a boot flash drive on the existing USB drive using the USB tool to create a 7.2 boot disk? Then copy over the /config file from the backup zip file? Is that essentially the same as restoring a full backup? Or even just try restoring the Nov 2025 backup?

How do I tell what version my backup ZIP drive is? I think it is 7.2.2 but I am not 100% sure. This backup is from Nov 28, 2025 which is one week after 7.2.2 was released. I presume this would be in one of the files in the backup? which one?

Insert the flash drive in a PC/Mac and try to copy the config folder; that's all you need.

I tried a fresh 7.2.2 install on the old USB and a different USB but I still got the same error. I tried the front USB port and still got the error. I removed all other USB devices, except the keyboard and got the error. I tried one of the rear USB ports and it booted. So it looks like there may be an issue with some of the USB ports on my motherboard.

I restored my Nov 2025 backup and got up and running. That was in OS 6.12.4. I am now upgrading to 7.0.1.

I will try the original USB port again later on to see if I still get the error or whether it was something sporadic. Very strange.