The problem is that i don't know is it from HD or motherboard. Monitor works in the beginning of boot (ram check), but after that it goes off. But Win is started i could copy on/from HD by network. On other MB i could boot from the HD(Maxtor 6E040L0), so the problem maybe is not the HD. The MB is Albatron KX600. Also Monitor works with another PC. Where is the problem ??????? I have 2 PC and the problem parts works on all combinations except in that. Albatron KX600 HD maxtor
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If the video is onboard, probably your mobo... if its a separate video card, then the video card is the culprit.
Another posibility is the Power Supply.
Need more information on your build.
The Albatron KX600 does not have onboard video, so the first suspect would be the graphics card.