Question Cause of Input lag on Pc

Feb 27, 2022
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Hello Sir,
Recently i purchased a used pc.
Pc Specs:
Cpu:Xeon E3 1270 v3
Gpu: 750 ti 2gb
Ram: 16 gb ddr3
SSD: 128gb
Hdd: 500gb
So mostly i play fortnite and getting stable fps but still feels lag (input lag). When i purchased pc there was a problem in my ssd. Its health was 41 %. So i am thinking that it is cause of my input lag or maybe something else. Please tell me what you think that cause problem.