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Re: yellow light on motherboard after installing new...
Yellow light not a good sign it must be green to operate at proper performance and standard operational, yellow light may indicate unproper power to motherboard i would go on line or call techincail support or go on line and type in
manufacture name, make and model of baord yellow light error
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You shouldread themotherboard manual,for cabling: 1. Power SW 2. Reset SW 3. HDD led 4. Power led - and power led + 5. Speaker Cablingscheme,alsowrittenon the motherboard.
If thePowerSWnotinstalledthe switch ondoes not work. If theResetSWnotinstalled the switch resetdoes not work If theHDD lednot installedthe harddrivelight(red)is not lit If thePower led(+/-) notinstalled thepower light(yellow)is not lit If theSpeakers arenot installed,whenthe computer is onthe beep soundis not heard.
Your computer power button may not be working, or the CPU may be bad and it can also be the motherboard is faulty.You need a new case or fix the power button or try another CPU in the computer or replace the motherboard.
the power supply seems to be fine> but we can check by removing the BIG ATX white connector on the motherboard> if the light is still on then the power supply is fine>>> then
we can first remove all the RAM from the motherboard> then connect the computer to power and then see if the Computer beeps or not> if it does the motherboard is fine > if it doesnt then the motherboard need to be replaced
Unplug the power from you 700xl and from you monitor. Try removing the cmos battery and reinstalling it. Then, plug everything back in and try restarting. If it continues to give you the yellow light, you may need to replace the CMOS battery, especially if it is more than two years old.
Another thing to consider is if your power supply is underpowered for the number of external devices you have plugged into it (i.e., cd, dvd, external hard drives, printers, pci cards, etc). Gateway installed very low powered power supplies in their 700xl desktop computers. Usually only around 250 watts maximum.
If you are replacing the power supply with another 250 watt maximum power supply, and you have a lot of external devices plugged in, you may need at least a 350 watt power supply....if your CMOS battery is not the problem.
Did some research and found this site which will tell you which pins to test. It is possible also that its not powerful enough for the devices you have. I would try again only giving power to the motherboard pins, of coarse and the hard drive. If works then plug one device at a time.
sounds like something is drawing down on your 12 volt supply drives or on board regulators. Try it without the drives connectged, and see if you can get the system to boot up(you'll just get a notice that your drives are unavailable, but you'll already know that, right?