if your mother board is failing then check the motherboard processor ,heat sink fan and the SMPS is it working or not .if you processor gets heat up then use the heat sink paste .it gives cooling to processor.
if you are facing the problem of wierd signs then it must be virus or window problem ..install a new window and updated antivirus to shortout this problem
If you getting the wi fi problem then fist check your wi fi connections and then then you device in which you are using the wi fi connection. and the check the manual settings of wi fi . Must be you will solve the wi fi problem with these steps.
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