Problem The computer boots normally, but behaves erratically after some time. Remedy The power supply may not be able to support the load inside the computer. The internal fan in the SMPS could have failed and excessive heat inside the SMPS might have caused the erratic output voltages. Check whether the SMPS fan is functioning. If the fan is okay, then switch off the power. Remove the power cable and open the cabinet.. Check the SMPS output voltages, after connecting the power cable and switching on the computer. If the SMPS outputs are not satisfactory, then check by replacing the SMPS. Now the problem is solved. Send the faulty SMPS for a service. Problem After adding one hard disk drive and one DVD drive to a computer, which already has a hard disk and CD writer, the computer does not start. Remedy Re...