IT Services is not funded or resourced to provide support for privately-owned PCs.
Your problems could be software or hardware related and may be easy or difficult to diagnose and fix.
As a first step you could try talking to whoever sold you the PC or to the makers. They may have a helpline which could advise you, for example, some makes of computer have a lifetime support phone line. Your computer may still be under warranty.
Alternatively, see this list of local repair companies.
Please note that we are not able to recommend commercial organisations. If you want someone to fix your computer, you should first make sure you know exactly how much it is going to cost.
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This is question number 341, which appears in the following categories: