In case it is in a standby state that won't wake, press and hold the power button until it powers off. Otherwise: The pattern of blinking is significant. Identify the pattern and check the reference here to see what error it indicates. Dell OptiPlex 3020–Mini Tower Owner's Manual > Troubleshooting Your Computer > Power LED Diagnostics Amber LED blinking scheme – The pattern is 2 or 3 blinks followed by a short pause then x number of blinks up to 7. The repeated pattern has a long pause inserted in the middle. For example 2,3 = 2 amber blinks, short pause, 3 amber blinks followed by long pause then repeats.
My optiplex 3020 power button flashes on and back off in an orange colour, the PC will not turn on
Computer won’t turn on