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Check the bios for any cpu overclocking settings and set it back to standard settings. Renew also the thermal cooling paste between the cpu and the cooling fan. See if the cpu fan is running when the pc starts.
Be VERY carefull when you remove the cpu cooling fan and take care not to damage the cpu. And take antistatic precautions when you work on the mainboard.
If you have not tryed this before let a expert do the job.
Is it black from the get-go? This could be a loose video cable, power cable on the monitor or a video card that's overheating due to a faulty fan... it could also mean the video card is gone. If it only looses display after it hits windows it could just need a driver update.
Ordinarily yellow light indicates ACPI standby. On some Dell and HP motherboards the same light also indicates a CPU failure, usually due to overvoltage or overheating.
Turn the PC completely off (unplug from the wall socket). Open the side, so you can see the motherboard with CPU and heat block. Best if you wait some ten-twenty minutes. Plug the power cable and power on the PC. Does it turn on, and does the CPU fan rotate correctly? If the PC turns on, and the fan doesn't, you have a busted fan which needs replacing.
If this doesn't solve the issue, describe exactly how the error happened. Is it a new PC, a PC which already worked and stopped doing so, a DIY assembled machine? Does it never turn on, or does it sometime do?
soks3d, With the system shut down, unplug the power cable from the power supply. Open you're case and pull the memory from the system wait a minute than reseat the memory. Re-connect the power cable to the power supply. Try booting the system and enter the bios menu. (Pulling the memory will clear any memory resident virus). This has nothing to do with the alarm buzzer sound you heard. Typically the alarm sound is generated by the CPU. It's an audible warning that the CPU is over-heating. The CPU will shut down you're system so as not to damage the motherboard and CPU. (Suggest you check the CPU fan for dust build-up. Use canned air to help remove any build-up. You can also use a clean paint brush to help remove any dust from under each CPU fan blade. It's also possible that the CPU fan is running far too slow and may need to be replaced. See page 3-23 in you're user manual. 3-8. PC Health Status. Open the link provided below for a new heat-sink and fan assembly for a socket 462; http://www.directron.com/a4004d.html If the CPU fan and heat-sink assembly seems clean it is also possible that the thermal grease / thermal tape between the heat-sink and CPU is too old and needs to be replaced. (Save this check for last). Below is the link for you're motherboard; http://www.abit.com.tw/page/en/motherboard/motherboard_detail.php?pMODEL_NAME=KV7-V&fMTYPE=Socket+A
If all the parts of your computers are fined functioning. This is a CPU problem witch is no display. Try to disassemble the CPU remove the heat sink the CPU and clean and insert it again. When you are now inserting the CPU be sure that you will put a thermal past in the heat sink so that the heat from the CPU are absorbed. If the heat will not be absorbed it will cause overheating.
1st Try some different memory 2nd Try this remove all attachments to M.board hard drive cd dvd all except for memory and video card and try to boot if it does install removed item one at a time and reboot and so on until you perhaps find faulty item Check all cables to hard drive and cd dvd are connected properly Red or Blue stripe nearest the 4 pin power lead and they are set correctly master and slave etc
You either have two issues . The heatsink Fan needs replaced ( it will shut down to save you from burning out the chip ) Or possibly the power supply has an issue . More than likely is the Fan for CPU .
Please make sure you mark my correct solution for your motherboard
Systems that shut down after being powered on can point to an over heating of the CPU. Other factors come into play with overheating. Too much dust build-up on & under the CPU fan blades. Dust builds up in-between the heatsink fins (Thus the CPU fan can not cool the CPU chip.) The CPU fan may be running too slow. When the PC system shuts down it’s saving you from hurting the system. You did not list the model number of you're system. Check you're system & clean the mentioned parts. Use canned air & a dry clean small paint brush to help remove possible dust buildup blow the dust away with the canned air.
You must have the CPU fan plugged into the CPU fan power connector or the system can not monitor the fans speed. Your PC will shut down & give you that message. (The fan must be connected to the correct power plug). If when you did replace the CPU's fan & had to remove the heat sink, which is where the fan screws into & did not clean the old thermal grease off the CPU & heatsink & replace with new thermal grease than your CPU will still overheat. If you add thermal grease over top of old thermal grease your CPU will over heat. This is all a balancing act. If any one is not correct your system will shut down. (This is better than killing the CPU). To remove old thermal grease use a clean cloth damped with house hold alcohol & use the same on the bottom of the heatsink. Please allow plenty of time for the alcohol to dry.