Monitor displays error message

[Sanyh]

So today i got my pc after replacing its PSU from a service centre. They tested it infront of me at the centre and everything was normal.
However after connecting my pc with a DELL monitor it got the following error message on the screen.

"The current input timing is not supported by the monitor display. Please change your input timing to 1366x768, 60Hz or any other monitor listed timing as per the monitor specifications"

What does this mean and how do I fix it?
Thank you for your help.

 

[Petrossa]

Hi there
This appears to indicate that the display resolution as set in windows is set to a level that your monitor cannot handle.
Try booting to safe mode, then changing the display resolution back down to say 1024x768 and then booting to normal mode.