Go to local shop and test and swap out each component with them.
I gave the system to local shop. He kept it for two hours and said he repaired the motherboard .. i asked the cause then he said something about power I/O covered in dust or something i could not decipher.
I had removed the hard disk before handing over the machine. Now when he was done he showed me the working of machine and it was indeed working. I could see the boot screen messages on their monitor. While this demo was being done, the system did not have my original cmos battery and before handing my machine to me they inserted a new cmos battery.
Now happy I brought the system home with the belief that it would work but to my surprise the machine was in the same state as I submitted which is it was starting and restarting intermittently by itself. I called the shop and agreed to handover the machine tomorrow.
This was possible when I had my day off today .. now i don’t know when the next muhurt (auspicious day) will come that i take this machine and go to the shop
The cost was ₹500/-.