Two tone alarm signal as the screen goes blank - what's wrong?
Posted on 2007-04-06
System: VIA Technologies Inc KT400-8235
Motherboard: Biostar M7VIT Pro
Processor: AMD Athlon XP 2500+ 1.8 Ghz
RAM: 512 MB DDR-SDRAM PC2700
OS: Windows XP SP2
Two days ago my computer powered up normally until reaching the desktop whereupon it powered off abruptly and a strange two tone beep alarm sounded from the MoBo (like an ambulance siren). It continued for a few seconds even after I pulled the plug. After a pause I tried to boot up again but got the warning tones right away.
What is this? ...... PS failure, Fan failure, CPU or Motherboard problem?
With the case open I notice that when I hit the power switch the CPU fan twitches but does not run. I removed the fan and cleaned it as well as removing a lot of dust and fluff from the heatsink. I tried a new fan with the same result. Now I suspect the Power Supply but I am wondering if it is time to replace this 3 and a half year old system - would rather not if the problem isn't too expensive but I don't want to spend $90 - $120 on a new power supply if the cpu or mobo are fried