You purchased a new RAM module and installed it in addition to an existing module on a branded PC. The new module is not detected by the computer.
Cause: Some branded PC manufacturers customise computer peripherals to deliver better performance. Due to this customisation or proprietary peripherals, a user is unable to buy and install peripherals available in the market. If you do, mismatch errors are encountered.
Solution: Upgrading of the RAM must be done through the dealer of your branded machine. Call their customer care centre for assistance.