The computer spontaneously reboots or turn itself off.
This computer problem can be usually attributed to a hardware issue. It arises when a defective fan or dirty fan which makes the computer to automatically switch off. If, however the computer is functional, then the problem may be wrongly attached cables.
Strange noises and vibrations.
This problem arises form defective hardware. The hardware problems will be as varied as heating which cause expansion of wires and melt some sensitive cables. Faulty electronic components can cause squealing noises. Regardless of the cause of the problem, first approach on fixing it will be to remove the case run the computer to discover the origin of the computer to detect the problem.
Your home page, default search engine, or web browser has changed itself.
This is a problem known as "high-jacking". This involves the installation of Spyware on the target computer via social networking or from email link. The spyware then sends a message to the browser to change your user settings. For example, change your home page to another web page. Most common computer problems as shown above can be handled by simple maintenance of computer. We counsel that computer users should spend a few minutes to run some diagnostic tests on their computers before discarding their computers and buying new ones.