Thomas came into work this morning and turned on his computer and nothing happened. He immediately called the help desk, and you were sent to fix his computer. While talking with Thomas about his computer, you find out that when he turns on the computer, he has lights and fans, but nothing else happens. He also tells you that nobody else has done anything with his computer. Nothing has been added or changed, since it worked the day before. You decide to try to re-create the problem, and when you turn on the computer, there are lights and fans, but no beeps and no video. You notice that the keyboard light does not come on. What can you determine about the problem with Thomas’s computer? (Select all that apply.) A. Motherboard has failed.
B. Video card is not working properly.
C. Processor has gone bad or is not seated properly.
D. Power supply is not working properly.

The computer system is a digital or electronic device, which comprises of an input device, output device, memory and storage device and a processor, all controlled by a software interface known as the operating system.

The hardware and software components are all integrated on a printed board known as a motherboard.

When the motherboard is faulty, the system looses it functionality and the screen stays off but the power supply indicator light stays on. This is also the same for the processor.