We had a power outage today and even with a good surge protector my PC now will not start. The green LED is on when the unit is pluged in but it will not fire up. I have 5volts on 2 wires going to motherboard, I have no power at the on/off button on the front of the PC. Question is: How do I know if my power supply is bad or the motherboard? Can anyone help?
Comment by kristech, posted on Sep 13, 2008
I have had the power supply in and out of the machine several times, I have reseated all possible connection cables and still nothing.
Just trying to figure out which part is faulty without taking the whole thing into the shop.
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Do you use a surge protector? If you do, try turning off the power supply to the surge protector and switch on again. There are a number of causes for this problem, the most likely being a PSU problem or a motherboard fault/failure. To check the power from the PSU to the motherboard, you will need a multimeter to make sure enough power is going to the motherboard. Also check the motherboard closely to see if there is any signs of corrosion or blackened areas, which could be caused by overheating components. Check for leaky or burnt capacitors.
if the system will not power on, I would suggest a new power supply as the first troubleshooting option as they are about 1/3 the price of the motherboard. The Flea Power indication on the motherboard only indicates power is reaching the board, not if all needed voltages are being received.
Normally on a Dell, if you are getting power then when you attempt to power on, you usually get a power LED indication on the power button. Solid Green/Blue is normal, Flashing Amber is Power supply bus failure, Solid Amber is normally a motherboard.
If you haven't bypassed the UPS and connected direct to the outlet, I would try that 1st, as the UPS could be the failure too.
You most likely just need a new power supply. You can pick these up for around $40 for a 450W, which is plenty for your machine. Pretty simple to replace, unscrew the 4 screws in back, around the fan on top, then unplug all the power wires, pull the old one out, and then put the new one in. There is a slim chance that other components were damaged, but this is your first step to fixing it. The power supply is the martyr of the computer. It will throw itself in front of power surges to save the rest of your computer....
the only thing i can think of is the power supply got fried that is the most common problem when it comes to the pc not powering on. Now hopefully that is all that it fried and not the motherboard my suggestion is to take to local pc repair shop and have them change your power supply or you could put it in if you familiar with how the machine is wired.
OK FIRST A POWER SURGE PROTECTOR WILL ONLY PROTECT YOU 7 % OF THE TIME, WHICH YOU JUST REALIZED. SO YOU NEED TO BUY A BATTERY BACKUP ALSO KNOWN AS A UPS.... I CANNOT STRESS THIS ENOUGH. BRING YOUR PC TO BEST BUY AND THEY WILL TEST YOUR POWER SUPPLY, IF IT TESTS OUT OK THEN YOU BLEW SOMETHING IN YOUR MOTHERBOARD. GET A BATTERY BACKUPS/UPS!!!!!!!!!!!!!!!
there are fuses inside psu`s some are solderd and some pop out it i would suggest that u throw the psu away and buy new chances are that it will only cause continues and may even result in complete mobo failure problems heres a link to a cheap psu http://www.microdirect.co.uk/(3649)400W-P4AMD-quiet-PSU-with-PFC-20-pin-24-pin.aspx or a more upmarket more powerfull http://www.microdirect.co.uk/(11879)ThermalTake-TR2-500W-Black-Silent-ATX-12V.aspx the choice is yours.