Good day, everyone.
First things first. I'm sorry for my bad english. ;)
Anyway. As soon as I turn my PC on, my monitor remains black. Light-emitter(Orange light) starts to blink rapidly, changing colours from orange to blue and back to orange. Each time I turn on PC, it takes longer and longer for my monitor to "turn on". Any suggestions/ideas what to do?
I've changed power cable/power socket but it didnt work.

It is either you video hardware, or the monitor hardware itself. When the system turns on, the video card reinitializes the monitor to a known state. It does this by sending it special code/signals. From your description, I think your monitor has a problem. Get it fixed.

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