Help Dell Dell OptiPlex 9020 PC boot issues

[2013]

I've been given a A Dell pc to see if I can fix, Ive taken a look and I'm not what the issue is, when powering up the PC has a orange light on the power button blank screen. I think it could be the motherboard or PSU but im not 100%.
I believe its a Dell OptiPlex 9020 but ill double check once I get a change.

Does anyone have any suggestions

 

[2013]

It could be anything from the tiny bit of info you've given.
You'll need to do basic troubleshooting first, remove all parts and test as you add them back /reseat them individually.

Sorry for the delay reply, got occupied with other things due to the bank holiday and ended up forgetting to reply. I have removed everything exept the CPU and power from the motherboard, I removed the cmos battery also but I still get the orange light.

Reset everything, pull cmos etc and then turn it on. Note down the LED flashes on the front, both white and orange and then lookup the error on "A Reference Guide to the Dell OptiPlex Diagnostic Indicators"

Thank ill need to do this, if I can keep track of the light, ill more then likely count to many knowing me

 

[2013]

Having a quick look online I found this



Taken from the below link

9020, power button LED, amber blinking | DELL Technologies

Hello Guys, I recently have ran into a problem with my pc (Dell Optiplex 9020) it's power button light was blinking orange like blink..blink..........blink. I looked up for this issue and f...

www.dell.com

ill give that a ago thank

 

[2013]

Having a quick look online I found this



Taken from the below link

9020, power button LED, amber blinking | DELL Technologies

Hello Guys, I recently have ran into a problem with my pc (Dell Optiplex 9020) it's power button light was blinking orange like blink..blink..........blink. I looked up for this issue and f...

www.dell.com

Looking at the LED codes below it seems to be a PSU issue

Table 1. Power LED Diagnostics

off	off	system is OFF
off	blinking	system is in sleep state
blinking	off	power supply unit (PSU) failure
steady	off	PSU is working but failed to fetch code
off​	steady	system is ON

Dell OptiPlex 9020 Mini Tower Owner's Manual | Dell UK

A bit miss leading as others have said its a PSU issue but replaced it and still got the same orange blinking which then people have said its a motherboard problem

Finally got some to day, I checked and Im getting the same error blink..blink..........blink amber light. I followed what they did but no change.

When I connect the power cable it starts up automatically, I get the blinking amber lights and after the 3rd light it reboots (loop).

Looking at link 2,3 system board, memory or CPU failure. I expected it was the motherboard, how can I check which part could be the issues without getting a another board ?