My cpu had a light spark ad then turned off.
i checked the power cord ,its working because monitor gets started when we swicth on the system but cpu is not even showing any l.e.d (any light)
when i press the power button on cpu its not working ,not even showing led .
no led or usb drive showing power even cd roms and floppy drive not showing light
fan does not start even when power plug is on
i m using p4 and its agp 8x/dual channel ddr
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Re: cpu cannot boot
Hi, the most likely place(s) where a spark could occur on your motherboard would be near the processor where the big transistors are, the capacitors. Such if it were the case would mean that your motherboard is most likely fried and therefore would require replacement. Check if there are any burnt marks or try to smell the motherboard. Arcing (spark) would leave a telltale burnt smell within the immediate area. Another likely place would be the capacitors themselves (3300uF/6.3V or something like that). Normal capacitors would have flat surfaced end with an indented X or T mark. If any would show a bulging, cracked, open or blistering open, then chances are they are busted, leaking, shorted - all meaning motherboard replacement. Aside from the motherboard, it might be that the power supply itself is defective. Normally (but not always) spark/arcing would occur in the hotside (the one directly connecting to the mains). You are probably better off buying a new PSu rather than have it repaired. In some cases, PSU with on/off master switch at the back have been known to have arcing/sparking problems. In this instance, switch replacement is possible without replacing the entire powersupply. In extreme cases, the said switch can be left out (removed) and the two wires going to it just twisted together and taped. Again this is on the hotside. If you are not comfortable working with power supplies, may I suggest you ask a competent service personnel to do the repalcement or removal and shorting. Hope this works out for you. Cheers.
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If you hear the CPU fan turn on that doesn't mean the CPU itself is working. It can be only that the motherboard is getting power. Check all your connections such as monitor and peripherals and re-connect them. If you still don't get P.O.S.T. or ANY letters or boot options on your screen then your CPU is dead. (unless your monitor is bad) Another easy diagnostic is using your ears. For example the pitch sound of the fan in some motherboards tends to lower and then increase because it's reading of the hard drive. This means your CPU is ok but either your graphics connection is bad or your monitor is.
Unplug all of your RAM, expansion cards and IDE/SATA devices. Leave only the processor and the CPU/heatsink plugged in, now try turning it on. If it boots, you should get a ram error, which is normal. If it doesn't boot, either the board, processor, or power supply is bad. Next, reinstall the RAM and start it up again. If it boots again, keep adding parts until you find the one that is causing the problem.
sounds like a power issue with the monitor. try to remove and reconnect its power cord. If same thing happens, try using a confirmed working power cord like the one you use with the computer and make sure you test it out using a confirmed working power outket. If it has the same issue, would mean you need to get a replacement monitor. Refer to the vendor if it is still in warranty.
start by removing everything, ram, any cards plugged in, drives etc. Then try and boot it. If the issue is still present, shut it down and remove the heatsink and cpu. I have known CPU's to be jolted out of their sockets after an impact. Take the heatsink off, lift the lever and remove the cpu. Check that all the pins are still aligned and straighten any bent pins then refit the cpu and lock the lever down. Refit the heatsink making sure that the heat transfer pad or heatsink paste is still present and lock it down. Plug the power cords and front panel wiring back in and try and boot it. If it boots, shut down and refit each item you removed one at a time, booting in between each item. If the issue arises again, the last item you fitted is the culprit. If you can refit everything and boot the system up, lady luck is with you. If you still cannot get it to boot after refitting the cpu, replace the mainboard.
Sorry but without special gear, locating a fault like this on a mainboard is a real pain..
The best way to troubleshoot the issue is to strip down the motherboard to just the CPU, and then apply power. If it behaves normally you would then begin adding items back on starting with your memory. The idea is that you keep adding items until the problem you describe appears. The last item that you added on would then be the issue. If you are not able to get it to boot with just the CPU onboard, then you either have a motherboard issue, or as you stated, a CPU issue. The only way to identify which it would be is to either try the CPU on another board, or try a different CPU on your board. Your board might have a set of diagnostic beeps built in. If you start getting beeps with just the CPU onboard, check your owners manual to identify the issue. It should only give you a code stating that it is missing memory and other items.
Try another (Known good monitor). Or try you're monitor on another system.
Remove all memory except 1 DIMM. Double check all data cables (internally) & power cables. Remove the added video card. Try booting the system. Watch for the case LEDs to flash/blink, listen for hard drive spin up /cd-rom spin up. Lastly pull the battery & check with a volt meter. Bios battery should test no less than 3 volts. Post the correct MD rev.