last night I shut down my computer and everything had worked fine, this morning after having a power outage and the computer not being on, it won't turn on at all. No light, no fans, nothing. Printer, scanner, speakers all are on and so is the monitor. Could this for some reason be the power supply. We built this computer from scratch over a year ago and havne't had one day of problems until this morning. Please advise!

Hi I would suspect: Inside the PSU itself are a couple of special fuses. Ususally the PSU has to be removed and the screws removed from the cover plate of the PSU. On the circuit board there will be a couple of fuses. [get fuse with the same voltage and amps ] However there could be other explanations: Double check power to computer. Check to make sure the power on/off wires are on the mother board properly. [I am refering to the on/off near the sleep reset bottons and NOT the case/PSU switch] If you are very confident [and I mean very confident which means you already know to use an insulated screwdriver etc] - short the pins briefly where the power on/off wire go to on the motherboard to see if anything begins to power up. If successful then: With a multimeter check the on/off function of the on/off button.

For a normal function of the Power supply to the PC, within from 0.1 to 0.5 seconds of turning the Power On, the PowerSupplyUnit generates what is called a Power Good or Power OK signal and this is received by the processor timer chip on the Motherboard that controls the reset line to the processor. Following Power Outage, until the voltage is stabilized , the PSU will not generate a Power Good signal neccessary for the Processor Timer Chip to stop resetting the CPU. Unless your Power supply Unit is a poor make , usually, shutting down the Power for about 20 seconds and turning the Power switch back On will solve the problem for you. Although you can test the PSU's ability to generate 5volts using a Multimeter, in my opinion, any PSU that refuses to function after a 'brownout' or transient 'blackout' is probabbly not suitable to support that PC. You could just try to Turn Off the PSU switch, open the case with Anti-static precaurions, pull the the Power supply connector from its motherboard connection, remove the CMOS jumper from its default Pins 1& 2 and placing it on Pins 2&3 for 10 seconds, replace the Motherboard PS connector, make sure all internal cables and Add-on cards are secure in their places, reinstall all external cables, Power On and Restart and see. This is just to rule out any associated CMOS Setup corruption preventing a reboot. If the problem is still persisiting, change the PSU with one that has good ratings.

I have had this problem several times. Here's what I did. I unplugged the power supply cords from the motherboard and reinserted them. This usually works. Sometimes I blow in the connectors. I swear that static discharge gets caught in the connectors. If that doesn't work, then purchase a power supply & swap it out. If the new one works, put the old one back in to double check. If the old one works,(fan comes on) return the new one. If the old one works but the computer doesn't start up, you may have to take the processor out completely and then put it back in to dislodge the static that built up. We have power outages 3-5 times a year and this is how I get them running again. I know some tech people who scoff at this, but it works for me every time!