Faulty Motherboard

The motherboard of my lenovo Ideapad flex 4 died and I got it replaced and the compute switches on now. But there are small problems such as touch pad only works when in setting on touch pad page and the rest of time mouse doesn't appear. when using the arrows in text it starts to delete the words when shifting. When at the begging of a documents it started to delete all the text within a few seconds. It has many small problems such as these as these all seem to be a software/coding type of problem. Please help I need to same my laptop.
 
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