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There are several versions of the K78S5A. The following answer applies only to v.3.x.
CPU: AMD Duron 200Mhz FSB CPU - 950 AMD Duron 266Mhz FSB CPU - 1800 AMD Morgan 200Mhz FSB CPU - 1.3G AMD Athlon 200Mhz FSB CPU - 1.4G AMD Athlon 266Mhz FSB CPU - 1.4G AMD Palomino 266Mhz FSB CPU - 1.2G AMD Athlon XP (0.18u) 266Mhz FSB CPU - 2100+ AMD Athlon XP (0.13u) 266Mhz FSB CPU - 2600+ I hope that helps! Good luck. GaugeMan
It sounds to me like the processor that you bought is not fully supported in the current bios in your mobo. I would check the epox website for newer bios. Be careful flashing the bios, if you misstep in the flash, you may end up with a brick. If you are successful, you should be able to run the processor at the speeds you expected, though within the limits of the hardware on the mobo. Also look at the spec's for the mobo on the site to see if your processor is listed as being supported.
Look for socket A processors and ignore the XXXX+ and focus on the XXXXMHz rating (the MoBo's manufacturer's support site will give you the max processor your Board will handle). Since you mention that your MoBo is 4 to 5 years old, you'll probably better serve yourself to replace the MoBo and processor (you'll be able to upgrade to a much better/faster processor by upgrading both, and shouldn't cost that much more), and probably be happier with the result. You may want/need to upgrade your Power supply while you are at it too.
Ok so you know the bat is good cause you checked the voltage. You double checked the bios jumper making sure it is not set to clear. Looking in your manual you can go to AMD XP3200+, & you are under that. So either you have a short or your bios needs flashed because it's messed up. Could have went when the cpu died.
Design ATX form factor 4 layers PCB size: 30.5x24.4cm
Chipset VIA KT266A/VT8233A Chipset
CPU Socket Support AMD Athlon 700MHz∼1.4GHz processor
Support AMD Athlon XP 1500+ 2600+ processor
Support AMD Duron 600MHz 1.3GHz processor
Support 200MHz/266MHz (Double Data Rate) Front Side
Bus frequency processors
Reserves support for future AMD processors
2600+ is the highest it will go.
http://www.machspeed.com/manuals/VIPER/V266B.pdf page 3
hi dale, itsnot a good thing when you see the blue screen of death, cause recent changes hardware normaly maybeif you have changed from intel to amd using mobo and all parts are amd now , maybe if you reinstalled your operating system the new hardware that is installed will accept you software cheers steve good luck