Dell optiplex 390 won't power on unless keeping it plugged to the wall

broudgames1 · Dec 18, 2017

So i just bought a dell optiplex 390 a month ago it worked like a charm till these days
If i turn it off for a long time it won't power on but the orange light on the motherboard lights on .. the problem does not occur if i leave the pc plugged to the wall (i'm using a surge protector)
but sometimes it just powers on just normally tho even if i turn it off for a long time

hang-the-9 · Dec 18, 2017

Could be a failing power supply, or motherboard. Try a new CMOS battery, cheap and may fix things. If not, try a new power supply. Although for the price of the system, it may be easier to just replace it fully in case it is the motherboard.

broudgames1 · Dec 18, 2017

hang-the-9 :

i don't think it's the mobo since the pc works great the whole day when it turns on (no sudden shutdowns no lockups) i suspect it's the psu but idk

studmoose · Dec 18, 2017

What type of surge suppressor are your using?
The date of sale?
How long was it used in the field?
Did it experience any power spikes or lightning strikes in the past?

APC battery backups expressly state not to install a surge suppressor between the unit and wall power. There must be a reason for this, when it should seem logical as a safeguard for the battery backup system. A failing surge suppressor would interfere with your street power quality to the point it trips sensitive equipment, as the power supplied downstream might not be stable or minimal for device operation.

broudgames1 · Dec 18, 2017

studmoose :

Here is a strange thing
When i open the case the computer turns on with no issues

hang-the-9 · Dec 19, 2017

broudgames1 :

studmoose :

Here is a strange thing
When i open the case the computer turns on with no issues

Is your house properly grounded? Try using the computer in another room or test it in another house if you can.

broudgames1 · Dec 19, 2017

hang-the-9 :

broudgames1 :

Is your house properly grounded? Try using the computer in another room or test it in another house if you can.

i don't know but the computer ran great when i first brought it
a guy told me to unplug the chassis intrusion switch from the motherboard

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