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Re: computer wont boot, only fan running
Well, the first thing that might be causing this is your memory card
(RAM). Try to remove it and place it in another memory slot on the
To be sure if your motherboard is still in good working condition, remove the memory card and power on the PC.
You should hear continuous beep sounds.
If you hear this then your motherboard is fine.
If placing the memory card in another slot does not work then the
problem lies with the memory card itself. You will need to replace it.
It could also be that some faulting PCI cards are causing this error.
Try to remove your PCI cards. Normally a faulting PCI modem causes this type of error. Remove it and then power on the pc.
The processor cannot be faulty but still if you want to check it, remove the CPU Cooler fan. Then turn on the PC.
Place your finger on the processor for 2 seconds. You should find
the processor heating up. Then turn it off immediately. If this works
then your processor is good. Remember not to leave it ON for more than 5 secs.
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sound to me like a video problem. no beep codes, you hear the fan going so it must be posting. could you try with other monitor and or cable? is there power to monitor? reseat cable at both ends( monitor+ pc)
Replace the fan or your computer will run hot and keep turning off.
Or are you saying this is what happens when you power on the computer? if so: When you press the power button do you hear fansrunning, hard drive spinning, lights on the computer, hear any beeps or lightsconstantly blinking, hear the DvD/CD drive click and the light on the drawer ofthe DvD/CD turn on for a second or two? If so the laptop is trying toboot or may have booted, but the screen is not showing for some reason.
Beep tones and blinking lights tells the technicians what is going on with thelaptop and why it is not booting. Most times it's a motherboard issuewhen you hear beeps or blinking lights continuous.
Continous beeps usually mean the motherboard or the power supply, Try another power supply first and see if it will boot, if not the motherboard is faulty, if the prossesor was faulty you would no beeps the fans would run but nothing on the screen. hope this helps.
Disconnect the power cable open the case and pull the CR 2032 battery out for a minute. That will reset the BIOS. If you have no Beep Codes at all the MoBo might be dead. If this were just a video issue there'd be Beep codes. If there's more than one stick of RAM Pull one try to boot then do same with second stick. if there's only one stick of RAM try reseating it.
First open cpu cabinet then pull cmos cell from motherbord for 10 minutes. Refix RAM memory. Reattch ATX power connector to motherbord. Reattch power cable and SATA or ide cable to harddisk. Clean dust from all parts of motherbord. Open processor fan and processor. Then reattch both. Make sure motherbord is not ground with cabinet. When you power up the computer press F1 or F2 or "del" key then enter in bios . Make sure in bios your harddisk is detected. If not then change SATA or IDE cable of harddisk. Then check .Go to boot menu nof bios then set first boot device as your harddisk.Then save settings and exit. Let me know if you need further assistance.Thanks.
However, take out the battery from the laptop and remove mains lead. Go and make tea! Then, drink it. Once you have complete this task.
Plug in the AC lead ONLY into the laptop and then try to power it on.
You should see lights on the Hard Disk LED or hear a beep. If you see them but nothing on the screen at all when booting then the capacitor pack has probably gone on the screen. This is not an expensive part, but you do need to know what you are doing to replace it. Think it time to give it to the workshop or ask IT bod to look at it for you.
If you have changed the power unit and the computer is still not powering up, then it is quite likely there is a motherboard fault - probably in the power management circuitry, which expects the power_good signal from the power unit at a precise moment in the boot up process. A fault in the power management circuitry would prevent the computer from beginning its boot-up process.
Do the fans in the power unit come on when the computer is switched on? If they don't - this suggests a power unit problem. If the power unit fans do start working but the computer still doesn't boot, this suggests either a faulty or 'dry' connection (easy checked) or a motherboard fault.
If your computer 'works' but nothing is displayed, try pressing Control+Alt+Delete. If it then boots up it suggests a power unit problem. If not .. we come back to the motherboard again.
A low wattage power unit can cause the problem you describe. Every 128 Mb of Ram needs 4 watts of power. Add more for the motherboard (up to 30 watts..) then the floppy/hard drive/dvd etc .. If the power unit can't supply the necessary wattage, it won't boot. The older 250-300 watt power units aren't suitable for modern computers with XP/Vista. Ideally, you should be looking at 400 watts plus -it will tell you on the power unit.
Though to be honest, it does sound like a motherboard fault.
The only other thing that can cause a computer not to boot up (though it will begin the boot up process) are other faults ... When you switch on does it actually display anything on the screen .. and are there any 'beeps'? 1 beep indicates everything is ok .. 3 short beeps and 1 long beep indicate a memory problem (and the computer won't boot..). 8 beeps indicate a video problem (and nothing will be dislayed on your screen). Same with 9 beeps .. which indicates a bios fault - and the computer won't continue the boot process.
If you have nothing .. no power whatsover ... it comes back to the power unit/mainboard. If you're happy that the new power unit you have put in is ok ... suspect the motherboard. If you have access to any unwanted or 2nd hand motherboard ... connect that. If your computer boots up ... its the original motherboard at fault.
Alternatively, rather than replace bits and pieces at random to cure the fault, take your computer along to a computer shop. It will take them minutes to test it for you and identify the fault.
Have you recently experienced a power surge or had an electrical (thunder) storm in your area? Potentially your motherboard and/or processor could be toast since the fan running and CD Rom drive opening will continue to function because they receive power separately from the motherboard via the power supply. If you have access to a different compatible processor, you could try to install it in the motherboard to rule out a motherboard failure, otherwise you're looking for a new motherboard.