How to test for hardware failures in a computer
If you suspect a specific piece of hardware is not working correctly, click the appropriate links below. Otherwise, if you are unsure which hardware may have an issue, we suggest browsing through the whole document for a proper diagnosis. Although hardware failures most certainly may occur in your computer, it is important to check for as many software issues as you can before proceeding. The fact is, most errors are caused by software (such as drivers) related problems, not by a failing hardware device. See basic troubleshooting for a good starting point.
Computer hard drive (HDD)
Computer memory (RAM)
Computer motherboard & processor (CPU)
Computer power supply (PSU)
Although some programs, such as SpeedFan, can help monitor the voltage and power supplied to computer fans, there is no software utility to test the integrity of computer power supplies.
There are methods of testing the connectors on a power supply using a multimeter. However, due to potential damage to the power supply, as well as the motherboard and other components connected to it, this information is not posted on Computer Hope. Due to their relatively low cost and easy installation, we recommend that users replace the power supply if it is believed to be failing or bad.
Computer CD/DVD disc drives
Computer network, Wi-Fi, or Internet
If you are having problems connecting to the Internet on all of your devices, you may be encountering a problem with your network or Wi-Fi connection. Below are the steps on troubleshooting networking and Wi-Fi related problems.