I took a trip to a colocation room, and saw one row where a number of orange lights were blinking. Some of these customers could have issues, but I think most of these customers make a habit of only connecting one power supply, causing the error lights to blink too. It certainly makes for an impressive picture when you take a 30 second exposure ;-)
View more datacenter images in my set
Press L to view it large, then F to show you like it ;-)
If you would like to license this image for commercial use, contact me (see my profile).