My pc won't display anything after it got put to sleep mode

[Microsoft Windows]

Yesterday I left my PC on and went to sleep. My brother saw that and put my PC to sleep, the next morning I saw that and tried to turn wake it up but it didn't worked (the fan started to work again but no display) so I turned it off and when I tried to turn it back on multiple things happened:-The screen know that something is plugged in-My PC started and turned itself off 2 times (still no display btw)I tried everything, take off and put back the ram, unplugging the alimentation, plugging my pc on my motherboard instead of my graphics card, take off my graphics card, removing the CMOS battery

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