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.
Is there any message that appears when you turn the computer on? Does anything post to the monitor during the boot process? Normally if the Video Card goes bad and the monitor works you will get a No Signal message on the Monitor. So you are so sure the monitor works, huh?
Since you went inside the computer check and make sure you pushed the Video Card (where the monitor plugs into the back of the computer) into the slot all the way.
Maybe your Power Supply is not working. When you press the power button do the fans start running and you hear the disk drive spinning? Just because you see a light at the the power button or on the motherboard does not mean the Power Supply is working correctly. I just changed one that did that.
Remove the Power Cord, Open the Case and remove one of thememory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x onit with an ink pen. If it fails to boot then move the chip to the nextmemory slot and try rebooting. If it fails take the chip out and set itaside, then put the other chip in and try booting it in both slots. If itboots, just to verify that the chip set aside is bad, mark an x on it and putit into the open memory chip slot and try booting.You didn't by chance remove the Heat Sink and CPU while you were removing the fan did you? If you did, you probably need to apply a fresh coat of Thermal Past between the Heat Sink and CPU.
Hello Chelleydiao, hi, its either you have a CPU problem or the monitor itself. Check or use another monitor to see if the problem is fix. you see an blank monitor can also be caused by the CPU if it fails to boot. the aid the checking, do you see any orange light on the monitor? or any indication.... the led light on the screen in summary: green or blue means there is power and the CPU boots up.
if orange the CPU fails to boot, if there are no lights on the Monitor panels, there are problems on the monitor. check these first....I need a much detail description.
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..
1) The flashing light and signal message indicate that the monitor is functioning but is not receiving a signal from the computer.
2) The memory that you added is liklely to be incompatible with the computer itself and is preventing the system from booting. The computer will perform a selftest when powered on. Normally when there is a memory issue, the unit will beep. In some cases, there will be no action.
Remove the added memory and attempt to boot the system. If it starts up OK, then the memory you have added is the problem.
I turned on my computer and the monitor displayed this message on the screen "going to sleep no input received". I checked the power cord and unplugged it, nothing. No lights are flashing or beeping sounds. The CPU is working just fine, anyone have any idea what to do
First please check whether the Monitor powering ON or not the see the colour of light of the monitor i.e, its green or orange or not glowing next see that all the lights showing but constantly flickering or else just see u r VGA or DVI Cable which is connected properly to the CPU if it is ok then remove the cable connect only the monitor to different machine in case still not comming then finally it is a monitor problem or else just check all the connections inside the CPU
In case its monitor problem either it will not power ON or else all the lights will blink constantly that means the refresh rate or the Resolution of the monitor has been changed in case if it is done just connect a different monitor boot in the safe mode by pressing F8 button after entering there change the resolution which will be in the display properties apply and reboot the machine or else turn off u r PC and connect u r Old Monitor and Boot the Machine
If you mean the Monitor is powered by an external power supply
Then that indeed is an option worth trying
Simply get a multiple voltage one and set it to the voltage of the existing one.
There may be internal problems such as the inverter
But this will be a repair shop job.