![K7sem rev 1.0 K7sem rev 1.0](https://obrazki.elektroda.pl/92_1224850713.jpg)
OK I have this K7SEM system I built for a friend about 2 years ago. She brings it back saying it won't boot. I check it out .. it won't even POST. Lights and fans, but no display or beeping, except if I leave the thing *unplugged* for about 2 hours, it will actually start to display a POST screen, but then die.
I suspect a CMOS battery so I replace it. But, I still can't get the thing to POST. The manual says short pins 1-2 to clear CMOS, but the mobo doesn't point out which pin is pin 1, and I read a couple other ports on other fora suggesting the documentation is wrong about either a) where pin 1 is or 2) which pins you short to clear the CMOS and which you short for normal operation.
So, which pin is pin 1 on JP1 on the rev 1.0 K7SEM, and which pins do I short to clear the CMOS? (I've tried every combination of JP1 and JP3, but no dice).
If this doesn't work, does this mean the mobo needs to be replaced? (I've already removed the mobo from the case to rule out case shorts, and I will also use a diff PSU, CPU, and mem card tonight to rule those out, but this is feeling like a CMOS issue to me).
I suspect a CMOS battery so I replace it. But, I still can't get the thing to POST. The manual says short pins 1-2 to clear CMOS, but the mobo doesn't point out which pin is pin 1, and I read a couple other ports on other fora suggesting the documentation is wrong about either a) where pin 1 is or 2) which pins you short to clear the CMOS and which you short for normal operation.
So, which pin is pin 1 on JP1 on the rev 1.0 K7SEM, and which pins do I short to clear the CMOS? (I've tried every combination of JP1 and JP3, but no dice).
If this doesn't work, does this mean the mobo needs to be replaced? (I've already removed the mobo from the case to rule out case shorts, and I will also use a diff PSU, CPU, and mem card tonight to rule those out, but this is feeling like a CMOS issue to me).
![K7sem K7sem](https://www.dreamhardware.com/media/catalog/product/cache/1/base_image/1200x/17f82f742ffe127f42dca9de82fb58b1/k/7/k7sem_1_large__1.jpg)
ECS K7SEM - 1.0 - motherboard - micro ATX - Socket A - SiS730S overview. Packaged Quantity.