My Dell Optiplex 3010 won't turn on but orange LED on motherboard

Check to see if any memory stick being installed.

@Chino de Oro​ I have installed the RAM, but the result is still the same.

It sounds like your Dell Optiplex 3010 might be experiencing a power or hardware issue. The orange LED on the motherboard often indicates a problem with power supply, memory, or other components. Here are a few steps you can try:

1. Check Power Connections: Make sure all power cables are securely connected to the motherboard and power supply.
2. Inspect the Power Supply: If possible, test the power supply with a different one or use a power supply tester.
3. Reseat Components: Try reseating the RAM and any other removable components to ensure they’re properly connected.
4. Look for Error Codes: Some Dell motherboards have diagnostic LEDs or beep codes that can give more specific information about the issue.

If these steps don’t resolve the problem, you might need to consult a professional technician for further diagnosis.

Re: I can see an orange light on the motherboard. The light isn't blinking; it's just a steady glow. But my PC still won't power on. 

the steady on orange LED is perfectly normal.  it is supplied by 5V SB of psu.

try replace cmos battery w a new one then clear cmos settings via mobo jumper.

you do not need to install ram to power on the pc, a normal working pc would power on but beep n beep when it detects no memory installed.

the 5V SB present does not mean psu is necessarily working.  If you have a spare verified working 24/4 pin psu borrow that to test 3010

After replacing the battery:

1. How to Perform a BIOS or CMOS Reset and Clear the NVRAM on Dell Computers
2. How to Run a Power Supply Unit Self-Test On a Dell Desktop or All-in-One Computer

#1 adds detail as to what redxps mentioned.  Replace the size 2032 battery first as he mentioned.

What color is the power button light?  Is it blinking an error code?  Note this may change after replacing the battery.  Bad batteries affect BIOS and therefore PC operation.  They sometimes also throw erroneous error codes.

2 posts above is an AI bot response.  They're not always accurate and are over-detaied.