I have a problem that has stumped me. I have a PC that won't power on, nothing, zip, nadda. I first thought of a bad power supply, so i bought one, still nothing, zip, nadda. I figured, hmmmm....ok maybe mobo. Replaced mobo with new one kept the new PSU in and still nothing, zip, nadda. Thought ok, it's a power issue, maybe it's the switch on the case, put new mobo, new PSU and everything else in a new case, still nothing, zip, nadda. I thought ok, maybe a device is making it do this so i unhooked all case fans, optical drives and floppy from the PSU leaving only the mobo and HDD and case hooked to power, still nothing, zip, nadda. So now i am stumped, where do i go from here what else causes a power issue like this? I made sure the case was properly ground on the mobo and that all case plugs like reset, power switch etc are in the proper places on the mobo. Just need a little more help thinking of what it could be. Thanks

Take the mobo out of the case and bench test it (not a metal bench though !) - you can simulate the on/off switch by shorting the two power switch pins with a screwdriver

try shifting frm one location to other( in ur house) may be the switch ur connecting in is dead i have loads of queries

Just keep buying new parts....eventually you'll hit on the right thing. lol!

I would hook up nothing except the psu, mobo, ram, keyboard, monitor, and mouse. No case at all - put the mobo on a wood board so nothing nothing touches the mobo but the connectors for keyboard, mouse, monitor, psu, (and vid card if you do not have on-board video). Make sure your P4 connector from the psu is connected to the mobo if the mobo requries it. Of course make sure your psu "1/0" switch is pressed to be "1" on the back of the psu. Turn the machine on by touching the end of a phillips screwdriver to the two pins on the mobo that your case switch normally attaches to. Momentary contact between these two pins will turn the machine on. If it does not start try replacing vid card with a pci vid card, then replace ram. Also check to make sure the mobo is not one that requires the cpu fan to be plugged into the mobo, in case you are using a molex-connected fan right now.