I'm the IT guy. Have you tried to reboot it?
I didn’t find my own solution in the previous comments, so here it is… Oh, I worked on the Apple iMac "Core 2 Duo" 2.8 24-Inch (Early 2008) A1225 EMC 2211.
I simply lift the LCD panel from the other side! Look at the photo in the previous step: after you disconnected that cable (data cable) you can lift the lcd panel and rotate it and the cable is long enough to bring the panel at a 90 degrees position (vertically in the air).
Than it’s up to you. I tried to place the panel side on the table but again the cable was too short. So I placed it on the inside of the case, which is free from other cable and boards. Not elegant, I know.
The important part is that in that position I was able to remove the 4 screws from the Power Supply board and easily disconnect the LCD cable! And it’s equaly easy to reassembly it.
Important note: the LCD panel is pretty heavy! Be very careful with the edges (the metal is sharp). Don’t let it fall. Don’t touch the boards and the other components.