No display but cpu fan is working condition (by 7 users)

I have a similar problem with my Intel mother board D865GLC and it not unbooted and sometimes it will got a blue screen while it was luckily bootup successfully.

I tried to solve this problem in the following steps:
1) I cleaned all the dust on my motherboard, especially those resistors hided by the heat sink of the CPU.
(it worked normally again for several weeks and then the motherboard is not so stable, the system are sometimes halted and sometimes the blue screen jump out :-( )
2) Then, I tried to check all the components - RAM, CPU, FAN and Power supply, etc. They seems all OK! but the problems still.
3) I tried to open the case and check the temperature of the board and the problems still.
4) I reinstall the system, but the problem still :-(
5) I am going to give-up; but I think the problem may due to the memory related, because can't bootup with no beep sound and blue screen are the problem of memory.. So, I try again to remove all RAM and using a contact cleaner to clean the RAM slot and the gold contact. The PC work again!!!

check the connection of your video card, this is the common problem of cpu's specially if you are moving from one place to another. try to uninstall the connector of your monitor to the video card. if you have an extra video card try to replace the existing then power on. loose connection of your video will give you a rapid beep sound. if you are using the on board vga you try to install a video card or try to tighten up the connector.