I want to know the different way to check wether CPU,Ram and Motherboard is working or not without any special instruments

Can you boot into the BIOS? If so, most have a verbose setting that will show you all of the POST (Power-On Self Test) output. That is the system doing a sanity check of the things you noted in your post. If they all check out and the system still won't boot, then you probably have a system disc problem. If you can't boot to the BIOS, then likely there is a CPU or motherboard problem.

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts learning and sharing knowledge.