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I started my medion desktop MEDION AKOYA P7385 D (MD 8883) up and I got only NO SIGNAL message on screen.

I have tested it with an other monitor, sam result. I pluged power cable out, pressen on botton for 15 sec and powerd on again, same result. I have got battery bios battery for 5 min out and again in, same result.

When it was working after setting on fan began to work for a while and stopped and after that logon page on screen but fan keeps working with loudly sound and I get NO signa on screen. What's the problem with my computer? Please help