Optiplex 7060 Not booting

All was working without any problems last night but when I turned on pc it won't boot.

Nothing on the screen.

No beep code.

Led is solid white like everything is normal.

Tried clearing RTC.

Tried swapping CMOS battery with a new one.

Removed every cable an tried one by one without any luck.

Removed RAM modulesi when I tried to boot it gave beep error code but this is just about memory.

Any ideas is appreciated. Thanks.