Hi Dhivakar_45,
Almost all the issues on Studio 1558 has been addressed in old BIOS updates and there are no known issues with the system that need to be resolved further. As you mentioned that the BIOS is updated and still the system is overheating, I would suggest you to replace the heatsink assembly first and then motherboard if the issue is not fixed.
Please reply if you have any further questions. I would be glad to assist you.