Asus A7N266-VM power switch problem

[edge929]

Here's the deal, the on-borad LED is lit up meaning that the mobo is getting power, but the computer won't boot up when I press the power switch and I'm pretty sure it's the power switch connection (blue/white 2 pin connector) is incorrectly hooked up. The manual is wrong about the jumper settings, so I think it may be wrong about the power switch connection also, although it could be right. Does anyone know which 2 pins it is? Any suggestions would be greatly appreciated.

ASUS A7N266-VM
Crucial 256MB RAM
Onboard Audio and Video
Athlon XP 1600+
Enlight mATX cases 300W

Much appreciated

 

[mechBgon]

The pins are on the lower row in that block, and you'll find their position silk-screened on the board. Welcome to the Forums

For the record, they're the fourth and fifth pins from the right, if that helps.

 

[edge929]

I know where the pins are, but I've tried moving them around in a million different combinations and nothing works. I even turn the 2-pin connector around, as the manual states that could be the reason it doesn't work. This is my 3rd computer I've built, just FYI so I like to think I'm not stupid. Thanks for the welcome.

 

[mechBgon]

Try shorting that pair of pins with a screwdriver tip, to test for the possibility of a faulty case switch/wiring.

 

[edge929]

That's exactly where I've had it the entire time and still nothing, no bootup. I'm not sure what could be the problem. THe power supply obviously works and I'm pretty sure the mobo works only because the LED is lit up. Just FYI, I only have the power switch connected, and not any of the others (speakers, IDE LED, Reset). Any ideas?

 

[mechBgon]

I've had bad case switches before. The switch is supposed to momentarily connect the two pins, so if you touch a screwdriver to them momentarily and the system starts up, that at least confirms they're the correct pins, and then the question becomes finding out where the case wiring is bad.

I have four of this board at work and happen to have the manual on my desk, which is why I had the supposed location of the pins on hand so fast here. However, when I built them, I simply looked at the board itself. At first I believe I plugged into the top row because the markings were confusing me. Or was it the bottom... If you don't get it powering on when you connect the bottom pins, try the same pair on the top row, I might have been mistaken. But I thought it was the bottom row.

 

[edge929]

That's exactly what I thought also. The markings and manual condratict each other. A tried the screw driver trick on top and bottom with ALL the pins, just to be thorough. My guess now is a DOA mobo. Just because the LED is lit up, doesn't mean the mobo works, right? Thanks for your help. I appreciate it.

 

[mechBgon]

Dang! The only other thought I have is that perhaps there's an extra stud under the board making contact with something it shouldn't. You might try it just laying on the desk out of the case before sending it back, just to see.

 

[edge929]

You were right, the mobo was grounded, but I'm not sure by what. I put in one screw at a time, thinking they were doing it, and I got all if them in without a hitch (fans still coming on). But once I got everything else hooked up, it did it again, but I knew it wasn't the screws, so I un-hooked the CD-ROM drive and USB cables, and it worked again. Then I immediately hooked them back up and it suddenly worked with everything hooked up. I wish I knew why it did that, but for now, I'm just glad it's working. Thanks a million for your help as I would still be racking my brains without it.

 

[mechBgon]

Sure thing I'm glad you don't have to send it in... been there, done that (with an A7V333-R).