Answer:
A. Motherboard has failed.
C. Processor has gone bad or is not seated properly.
Explanation:
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.
The correct sequence is: 5,3,1,4,2
When you are installing software on your computer you need to first open the CD-ROM and then insert the installation CD into the CD-ROM. If the contents of the CD opens, click on the executable file to start the wizard, and then follow the prompts in the wizard. Finally, you often need to reboot your computer after installing a new program.
The answer & explanation for this question is given in the attachment below.