Hi,
I was able to see the light on the CPU. This means the CPU is having issues or the connection to the motherboard.
The common causes of the light over CPU means -
- Power supply
- CPU overheating
- Incorrect CPU installation
- Damaged CPU or socket
- BIOS
- RAM issues
- Motherboard issues
As your system worked before so we can rule out the incorrect CPU installation.
You have tested with RAM also so we can rule that out.
Power supply and CPU overheating we can ignore as it worked before and you did not make any changes to the system.
I would recommend you check up with the service center to make sure your motherboard is working fine. MSI service center would be able to check the motherboard for you. If your motherboard comes out fine then you will have to check up the CPU for any damage.
Please let me know how may I help you further.