I've just built a pc around an ASUS TUSL2-C MB with 800Mhz processor. On first power on the bios loaded after the correct single beep. The settings detected the processor as being 400Mhz so I changed this. It still loaded on a further power up. Then it wouldn't boot as far as the beep, unless I pressed reset, and started again from unplugged. Now, it's refusing to boot up at all. It powers up (fans, HD spins) but no beep, and nothing on the screen.

I've tried a bare bones power on. I don't think it's the graphics card as it worked before.

Any ideas????
Bruce. http://www.PCGuide.com/ubb/wink.gif

A couple of things cold cause this. ATX power supplies MUST be unplugged or switched off when you add or remove cards, so if you reseated anything while it was plugged in you could have fried video card or memory.

Some CPUs will not work at the wrong system bus speed, so try clearing CMOS and double check the bus speed and multiplier when resetting it. I built a P-4 1.6GHz machine for a friend a few days ago, it did the exact same thing. I had the bus speed wrong and it would not boot, no video or beeps. Once I set it at the correct system bus speed it worked perfect.

Also double check the plug going to the monitor, and make sure it is actually turned on...I've forgotten to turn the monitor on more than once. http://www.PCGuide.com/ubb/eek.gif (no, that won't make it refuse to beep...)

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Thanks. How do I clear the CMOS then?
And how do I set the system bus speed - the processor and RAM are both 133Mhz i think.
Bruce http://www.PCGuide.com/ubb/wink.gif

There should be a jumper (sometimes near the CMOS battery) that you have to short. Most of the ones I have seen are 3 pins, you move the jumper to the 2 pins it's usually NOT connecting, wait a few seconds and then move it back.

The PSU should be turned off or disconnected when you do this...

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