Have you tried the obvious!
Is the socket live and switched on? (plug in a known working device like a light.
Have you checked the new lead / fuse. If there is a short in your PC (Transformer) it could take out the fuse without you knowing. Some kettles have the same female connector.
Is the switch On at the back of the PC.
Are the power and multiway connectors firmly plugged in.
Do you hear any thing when you turn the PC on, Fan, clicks, electrical "cracks" / sparks.