Check the main board and check across all the caps and see if any of them are raised. All it takes is one raised cap and the board is bad unless you have the correct capacitors to replace. Very tricky!
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Re: loss of power
A setup or configurations that helps prevent a computer or network device from failing in the event of an unexpected problem or error. To make a computer or network device more fault tolerant requires that the user or company think of how a computer or network device may fail and take the necessary steps to help prevent the computer or network device from failing when that problem occurs. Below are some examples of steps that can be taken.
Power Failure - Have the computer or network device running on a UPS. If a computer, setup the UPS to properly turn off the computer after a few minutes if the power is not restored to help prevent the computer from data corruption. Another good idea, if available, is to have system messages sent to all network users or the administrators letting them know about the power failure and/or that the computer is being shutdown because of the power failure.
Power Surge - If no UPS is connected to the computer or the UPS does not provide surge protection, a surge protector connected to the computer or network device would help prevent the device from failing in the event of a power surge.
Data loss - Run backups daily or at least monthly on the computer if important information is stored on it. Create a mirror of the data on an alternate location.
Device / Computer failure - Have a second device, computer and/or computer components available in the event of failure to prevent a long down time.
Unauthorized access - If connected to a network, setup a firewall. Frequently check for updates for the device and/or computer operating system, lock device or password protect the computer when not in use, and store the computer or network device in secure area or area that can be locked.
Overload - Setup an alternate computer or network device that can used as an alternative access point or can share the load either through a load balancing or round robin setup.
Virus - Make sure the computer has updated virus definitions.
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Either you PSU ( Power Supply Unit ) has failed or your power switch has failed both very easy to replace as long as you take all the usual safety precautions prior to any repairs such as disconnect the power touch the plug of power cord to disperse any residual current and static strap or hand on the chassis to discharge the static then you can proceed in removing the PSU or Power switch and replace with an equivalent part. I hope this helps.
Are you checking the voltage outputs of the PSU with it connected to a motherboard or standalone? Most designs will not power up if there is excessive load (as in a short/high current), however, there are also designs that will not power up if there is no load.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
measuring 12v at the psu is not enough.
the psu have several voltage outputs ranging from 12volts to 3.3 volts and maybe even 2.2 volts..
firstly, check all onboard USB ports, a bent or shorted pin in a USB port will prevent the psu from operating.
next, the psu has a safety connection to the mainboard, this is called the power good signal ( pwrgd) and it is a signal from the psu to the mainboard and tells the mainboard that everything in the psu is functioning correctly. If the powergood signal is lost ( drops from 5volts to zero volts) the mainboard will issue an interuppt to the cpu and the cpu will shut down, this will also shut the board down to prevent damage and data loss. mainboards all use pretty much the same connectors so your board will have either a 20 pin power connector or a 24 pin one. It may also have an additional 4 pin connector to power the cpu and northbridge functions.
use a known good psu and plug this into your board along with the 4 pin connector and attempt a switch on. If the system begins to boot, replace the psu. if not, try unplugging or removing everything connected to the board, pay special attention to expansion cards and usb ports.
remove the ram sticks and video cards if fitted, then attempt to boot again. if the system does not respond, replace the main board. if it now begins to boot, refit everything one item at a time and try starting the machine. turn off before refitting the next item and start the machine up again. when you get to the problem item, the machine will stop starting.
If all else fails, replace the mainboard or take the machine to a reputable repairer..