Noticed power led has not working as well.

Is it just the indicator or the entire functionality is also gone?

Indicator works " HI " displaying

Reset button and hdd led works also..

Suspecting cmos??

The actual connection to the board may have an issue. Typically those displays are not connected to the board but to the switch (as a DPDT or similar) and power, depending on what position the switch is will set the display different and activate Turbo.
I suggest using a jumper on the turbo switch connector on the board and see if that sets turbo mode, you would need to run a benchmark with it jumped and unjumped....
That would help rule out the board and point to the wires or switch

Horun wrote on 2024-07-01, 00:35:

The actual connection to the board may have an issue. Typically those displays are not connected to the board but to the switch (as a DPDT or similar) and power, depending on what position the switch is will set the display different and activate Turbo.
I suggest using a jumper on the turbo switch connector on the board and see if that sets turbo mode, you would need to run a benchmark with it jumped and unjumped....
That would help rule out the board and point to the wires or switch

Thanks but im not changed any jumpers they are default.it should work. Any other suggestions

is it possible broken diode?

Yes eventhough you haven't changed any jumpers, we're asking to know if the turbo functionality is working regardless of the LEDs. To be clear, now when you press the turbo button or depress it, what happens?

1) Computer speed is unaffected whether Turbo is pressed or not.

2) Computer slows down/speeds up upon toggling the button, yet the LED indicators remain unchanged.

Depending on whether it's 1 or 2, you can focus your investigation on a different area to solve the problem.