Possibilities:
* leaking/bad capacitors on the motherboard, not doing their job, i.e., causing voltage fluctuations that the motherboard cannot tolerate;
* dead disk-drive -- cannot boot Windows from a "dead" drive;
* dead CPU -- cannot do anything other than power on/off;
* failing power-supply -- not supplying correct voltages to the motherboard.
Take the laptop to a qualified computer technician, for professional trouble-shooting, and probably a replacement of the motherboard. But, it might be less expensive to "salvage" the disk-drive (and your files) from the laptop, and to buy a new laptop, than it would be to buy a replacement motherboard, and pay for installation.
Thank you for your advice. I need to know which component is faulty on the circuit board
> need to know which component is faulty
Replace the CPU, and see if that fixes the problem.
Replace the RAM, and see if that fixes the problem.
Replace the power-supply, and see if that fixes the problem.
Inspect the capacitors on the motherboard, looking for brown "rust" on top of a capacitor, or leaking from the side. Look at the top of each capacitor -- a "good" capacitor will be very "flat", while a "bad" capacitor will be bulging.
>> Do you have the schematic of the motherboard <<
No, but I have not accessed the web-site of the manufacturer of the computer, to see if they have put a schematics diagram online, as part of a "Technician's Service Manual" for the motherboard.
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Thank you for your reply. I am a qualified technician and I have done the entire standard test and visually inspected the motherboard. My only concern is to fix the motherboard. Do you have the schematic of the motherboard or any experience related these types of faults.
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