First check your cord from the computer to the monitor to make sure the connections are clean and good on the blue vga cord. Plugging it in and out a few times will help clean the pins and holes.
If that is ok: then it may be bulbs.
Pink means that you have bad bulbs inside the screen. sometimes the pink goes away when the bulbs warm up. eventually it won't stay on.
There is a slight chance the power board is also getting weak. You would have to open it up to tell this.
Once partially opened, Disconnect the wide set of wire that goes from the back of the screen to the monitors main video board and then try to turn it on, If it is still bulbs they will really show up with this setup.
If you send me a picture of the power board to [email protected], I may be able to tell if the board has issues by looking at the picture of it.
Fran