tried to install this graka, 6pin in, blue light of graka on, all fans of pc were running, but screen, mouse and keyboard had no signal, can anyone help me?

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It is also the case with many ready-made PCs from e.g. HP that the bios or the mainboard does not support graphics cards or only supports them to a very limited extent. Is it possible that your PC is a ready-made PC?

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Do you perhaps have a Ryzen processor and the monitor connected to the mainboard and not to the graphics card because, for example, the Ryzen has no internal graphics and therefore you have to connect the monitor to the graphics card?    
to the graphics card.

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what kind of graka did you have before? did it work properly? 
what about the computer? what components do you have inside?
maybe your power supply is definitely too weak...(the current on the supply line to the graka). you can calculate it here:
http://www.corsair.com/de-de/psu-finder

Answer

I saw that my power supply unit can only manage a maximum of 460 W. Could this be the problem?

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tried to install this graka, 6pin in, blue light of graka on, all fans of pc were running, but screen, mouse and keyboard had no signal, can anyone help me?