Someone improperly shut down my computer. This resulted in the message that the computer was not shut down properly. During the scandisk process, the system stopped at 80%. The computer was shut off via the power button. When the power button was pressed again, nothing happened. The monitor is ok. I could not hear the normal startup noises and the operating system did not load. I am looking for the best place to start troubleshooting. Any suggestions would be greatly appreciated.