[GEEKY] Why does my LCD display not wake up?

When my computer turns on it can often take 30 to 120 seconds for my Samsung LCD display to wake up. Facts of the case:

• Display is 213T and is something like 3-5 years old

• Office can be cold

• I am sure the computer is ready within seconds. It's just waking up. It will play music for example right away.

• In every other respect the display is fine

• It has always done this

Do you know?