There are 5 main components and without them system cannot started.
1) Motherboard
2) Memory
3) Hard Disk
4) Power supply
5) Microprocessor
6) System software
7) People
And 5 extra component and without them computer can be started.
1) Printer
2) Scanner
3) Mouse
4) Speaker
5) Cd rom/DVD rom
6) Floppy drive
7) monitor
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