yellowish shade on LCD

[ErwinRommel]

When I woke up in the morning, everything supposed to be excellent. Until I turned on my PC and... I was shocked of what I saw- everything my HP L1520 LCD monitor was showing had this awful yellowish shade! I don't know why did this happen, nor what to do next... Any suggestions?

 

[Apokalipse]

it's quite a common problem that the cable that goes to the monitor is loose or damaged, so may not be showing some colours as intensely.
check if the cable is loose, if not unplug both ends and see if there are any bent pins.
if some of the pins are bent you should try and get a pair of pliers and carefully bend them back straight