Dead pixels are the pixels that don’t work.It appears as if some dust particles had stuck permanently on your monitor.Before you buy an LCD monitor check for it.You can this dead pixels appear only when you switch on your monitor.These are impossible to fix in most cases.
To check for dead pixels in your monitor
* download this small utility called DPT.
* Before buying your monitor take this utility with you.Its only 221kb.
* Ask the dealer to run this software on the monitor you choose.
* The software can check whether dead pixels are there.If you find any, you can choose the one free from defects.
If you have bought the monitor and later you find it you can ask for replacement if it is under warranty.