Gx260-Gx280 have a known issue with the motherboard capaciators. Take a look at the capaciators on the motherboard and check if any look like they have bludges at the top particularly around the memory banks. If any of them look like this the motherboard most likely needs to be replaced.
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Do you mean the monitor's power light starts green and then turns orange when you turn it on? Most monitors will go to a power saving mode when they do not get a signal from the computer.
The Dell GX260 has a green power light when on. When the computer is off, the light is off. If it is green and blinking, then the computer is in a power saving mode.
Diagnosis: start with the obvious: is the monitor cable plugged into both the computer and the monitor (if not permanently connected to the monitor)? Are you connected to the active port? (You can add a video graphics card in most desktops. The motherboard video port usually needs to be disabled to use the card ports. If you plug in the monitor cable to the disabled port, it won't work.) Is the monitor set to the correct input? (This applies if the monitor has several ports. In that case, there will be a Source or Input button on the monitor.) Is the computer on? The GX260 has the power button on the front. (Other computers have the power button on the top.) There is also the power supply switch on the back which needs to be on.
Next try a different data cable between the monitor and the computer (if you can). Try a different monitor. If a second monitor works, than the monitor has a damaged main board. If the second monitor doesn't work, then the video graphics adapter has probably failed. Replace the add-on card, if in use, then boot in the safe mode to remove the old graphics driver. Then install the correct driver for the graphics adapter.
Note: the computer and the monitor should both be off when you connect the cables. Then turn on the monitor first and set it to the correct source before turning on the computer.)
Typically, I would start out saying the power supply is bad. However, there is a slight possibility that the system is in hibernate/sleep mode. Please ensure you unplug the unit for a few moments, then return power and try once more.
If that fails to resolve the issue, you may need to try another power supply. I believe someone like Best Buy or another local computer shop may be willing to 'test" the power supply to verify it works or not.
An orange/amber light is almost always a power problem. Is the amber light on the monitor or the PC itself? I'm assuming the PC since you have the ability to read the screen. Your best bet is to check your power supply in the PC. Do you have a power supply tester (about $20) or another PC? You can switch them out and see if the orange light follows the power supply. Let me know what you find out.
1. motherboards for atx form factor pc's are powered even when the computer is off, particularly if you leave the computer plugged in to wall outlet... you better do not work on you computer while power cable is still connected to both, your pc and the wall outlet..
If all you did was change hard drive I suspect the hard drive has been installed wrong Ensure blue or red stripe goes to the number 1 pin on M/board and the stripe goes next to the 4 pin power supply on hard drive
I had the same issue and accidentally discovered a temporary solution. Unplug the power from the back of the machine, open the case and unplug the ATX power connection from the motherboard. With the ATX cable unplugged, plug the power cord back in. When you try to turn the computer back on the power light should turn orange and fans should be spinning, with it powered on plug the ATX connector back in. That should turn the computer off. Turn it back on and it should boot fine. You can even shutdown and restart, but when the power is unplugged you will have to go thru the same process to get it back up. This sounds crazy but it worked on mine. Good Luck!
Have you checked the post lights located in the back of the system by where the keyboard plugs in?
There are is a row of 4 lights; either yellow or green. If the systems gets stuck at a particular post location, the lights will tell where.