Yes, a flashing amber power button is either bad cmos or psu.
I have an Optiplex 9010 which does not power on. Symptoms: Front power button does nothing - even if I hold it in for a while. - Power Button blips amber every 5 or 6 seconds.  Not the same as an error blip - very very short and only once - Power supply makes a faint chirping sound if you put your ear next to it - Test button on the back of the PSU goes green when I push it - and appears to power on the machine - but still no POST - it just seems to initialise the USB devices and spin the fan.  - If I hold in the green button for about 30 seconds, I get a a 2-3 amber code on the front power button (cpu/ram) - Tried hard reset  - still can't get the front button to do anything - Tried different RAM - nothing different - Going to try new PSU - but I'm suspecting CPU?  - Any other ideas?  Could it be the PSU still as the machine is not powering on from the front power button - perhaps some logic in the CPU not seeing the front power button press. Thanks,  
Power button blips amber every 5 or 6 seconds - no power no POST