|Solid Orange Power light|
Since the system is stopping at a solid amber light, it means the power supply is good, but the system is not able to distribute power to the components. This usually indicates a motherboard or processor failure, though some other component may also cause this.
This is one of those cases where you would need to strip down the system and start with minimal hardware installed.First remove all the PCI cards and the memory, as well as disconnecting the drives, to see if the system gives a beep code for no memory.
Next, add back the memory, one stick at a time if you have two in the computer. Connect the hard drive back to the system and see if it will boot up from this configuration. If not, then if you are using the onboard video, try an add in PCI video card. If it still will not boot then the problem is likely to be the hard drive, mother board or processor.
You would want to try another hard drive to test. If you can boot from this configuration, then add back the other drives one at a time, then do the same with the PCI cards. At the point where the symptom returns, that will tell you which part is causing the issue.
You would want to refer to your manual and follow the directions for how to do the above steps.