Question In need of help

Apr 22, 2019
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Hey guys I'm in need of help
So guys I just bought an assembled cpu, got delivered today but facing a minor problem as keyboard is acting weirdly its automatically typing random keys . But that same keyboard is working fine on other cpu. Thought could be a virus , but installed antivirus and while scanning no threats were found. Tried changing ports nothing worked . Ports are tested and working fine. It was also typing random keys in bios settings too so I thought it could an big issue so I took it to a professional and while testing everything worked fine there ( the same keyboard) andi further tested it and it worked fine there and then I took it home now facing the same problem again ( randomly typing keys and sometimes not working at all ) I'm thinking it could be a monitor issue but monitor is working fine in other cpu . I'm running out of options plz help asap.

Specs - crt dell monitor ( don't laugh)
And ryzen 3 2200g
8gb ddr4 ram
1 tb hdd
Mb - gigabye a320m - s2h
Windows 10 pro 64 bit