Hi Harris Khan
We could have two scenarios here.
1- Solid Orange - Means the presence of the POWER_GOOD signal. The POWER_GOOD signal, in turn, indicates the power supply is performing all its basic functions but the Motherboard is unable to distribute the same- issue likely to be solved by replacing the mother board.
2- Blinking Orange - Indicates the POWER_GOOD signal has not been issued by the power supply- Likely due to a power supply failure but you need to confirm the same by testing the health of the power supply by pressing the test button at the back.