Are you sure that you have really lost all those components? By no means impossible but very very rare.
How much do you trust "my repairer?" It does happen that a less scrupulous repairman is trying to sell you a new one!
It looks as though you are not used to poking about inside a PC but some components are easily replaced.
Please add more details of your misfortune to help diagnosis. Many members will be only to pleased to have you up and running again or at least try to guide you in your own recovery.