My mums asked me to fix her old laptop, it’s a Sony vaio model pcg 7131M, but I’m not too sure what’s actually wrong, the screen has weird lines on it but only on the vaio screen not on the boot screen part. and it says I need to either start windows normally or repair , when I click repair it tried to repair the disk but it must of failed because I went away and come back it turned off I turned it back on to get the same screen. My question is should I replace the hard drive or motherboard? Neither is going to be expensive jus want to know where to start.