Tested and found to be faulty. Looks like the ram is missing, so this could be the cause of the faulty. Flashing white light at the bottom when switched on.

Processor: Intel Core Duo
Screen Size: 20 in
RAM Size: 1 GB
MPN: A1207
SSD Capacity: 250 GB
Product Family: iMac
Processor Speed: 2.16 GHz
Brand: Apple
Series: Apple iMac
Type: Desktop
Operating System: Apple MacOS
Hard Drive Capacity: 250 GB
Storage Type: HDD (Hard Disk Drive)