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CPU and chasis fan runs but computer does not post, boot or beep

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UP..memory motherboard failure..most likely.

Posted on Jun 03, 2008

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Computer wont boot, the fans keep running


Does it come with any beep sound, because beep sound clarify the fault. Check it by the way.
The list is given below.

No Beeps Short, No power, Bad CPU/MB, Loose Peripherals
One Beep Everything is normal and Computer POSTed fine
Two Beeps POST/CMOS Error
One Long Beep, One Short Beep Motherboard Problem
One Long Beep, Two Short Beeps Video Problem
One Long Beep, Three Short Beeps Video Problem
Three Long Beeps Keyboard Error
Repeated Long Beeps Memory Error
Continuous Hi-Lo Beeps CPU Overheating

best of luck!

Mar 07, 2012 | Compaq Presario S4040SE - (refurbished)...

1 Answer

Cpu fan works, power supply fan works why wont' computer come on?


Could be a number of reasons:
The CPu fan and the PSU fans will come on, even though the system is not working. There is a possibility that the CPU has blown, you can check this easily by (carefully) feeling the heatsink after it has been running a while. A dead CPU will not use power and therefore not heat up. If after say 10 minutes of running, the heatsink is clay cold, suspect the CPU. Replace with another one, spreading CPU grease on the top before putting the heatsink back on.

A blown CPU will usually be indicated bu there being NO beeps from the system (see below)

If the CPU appears to be generating heat, visually inspect the board, look for blown or blowing capacitors (the small cylinder like components) on the motherboard, any that are bulging or leaking a brown residue, or have blown, will render the motherboard inoperative.

If these appear ok (they still may be damaged), unplug all components except the hard drive, and ram and video card, see if the system then boots. If it does, proceed to re-installation of each in turn, until the faulty peripheral halts the boot.

Listen for any beeps as the ssytem switches on these beeps describe the type of problem
(repost if you hear any beeps)

Remove one stick of ram and try rebooting, if it works, suspect the ram module, try the other and see if that makes any difference.

Failing that, your last recourse is to power the system off, remove the bios battery, replace after 2 minutes and see if clearing the Cmos "unsticks" the computer.

After That, suspect the motherboard is dead.

Apr 25, 2011 | PC Desktops

1 Answer

CPU fan and chasis fan runs at twice the regular speed of 2k rpm and 1k rpm respectively. The cpu temperature is normal and pc is in a cold environment. This seems to happen more when I watch online...


It is absolutely normal, CPU fan RPM can go as far as 3500 Rpm and Chassis fan as far as 2000Rpm. Best to have a cool PC, if you would like you can take a look at my tip entitled My Computer is not turning on!!! Is it dead!!! No POST!!! it explains every-thing.

Thanks
damnor01

Nov 11, 2010 | PC Desktops

2 Answers

I'm having an aspire m5640. it does not boot. beep?


Yes if there are error on the system you should most likely hear a beep most of the time when there is no beep it is due to bad ram. Some times beep codes can't detect bad ram and your computer will not boot.
Open the computer up and see how many ram chips you have if you have more than one take the one in dimm slot 2 out. There should be small writing next to the slots 1,2,3,4 or Dim 1 dim 2 ect ect. you always want to keep slot 1 with ram so start by pulling out the ram out of slot 2 and turn your computer on. If your computer still dosn't post pull the ram out of slot 1 out and insert the ram that was in slot 2 into slot 1 if still no luck it's most likely your board but the best way to test this is to know that you have a good working stick of ram you could purchase one and if it dosnt work bring it back ... theres also the chance of your video card being bad but there is usualy a post code for it (beep code)
if you have no clue on what ram looks or how to open your computer just google for installing ram on a computer and you should find step by step guides

Jun 02, 2010 | Acer Aspire m5640 PC Desktop

2 Answers

The desktop won't reboot. The power light stays yellow. I hear a fan running, but the monitor says no signal.


If your fan runs and the hard drive spins up, then you have a video card problem.
I'd do this: Disconnect everything inside the case but the CPU, memory, and video. Now try to boot. Also observe the fan on the CPU--does it spin?
If this fails, then your video has probably gone bad. Also--does your computer usually give you a "beep" when it starts up? If so, is it giving you a beep now? If not, you're failing the hardware startup test (POST).
So, your problem may be the video card. If your video is part of the motherboard, then you need to replace the motherboard.

Oct 01, 2009 | PC Desktops

2 Answers

Computer starts but does not post Athlon XP KM4M DDR


if the system made no beeps after the machine was booted with no ram its a bad board...sorry

Aug 10, 2009 | PC Desktops

3 Answers

CPU fan runs at high speed and won't boot


Change the setting in the BIOS menu. reboot your computer.. when you see the dell logo.. press F1 (or F2 if F1 doesn't work) button until you see the BIOS screen. Check for fan options and change it

Jun 20, 2009 | Dell OptiPlex GX520 PC Desktop

1 Answer

Emachine Will not boot


different beeping patterns are codes which indicate what part of the hardware has failed (ram, video card, cpu, ect). the fan failure would not cause beeps, and would not cause the cpu to fail unless already in windows. if you could find out the manufacturer of your motherboard you could check with them about what the paticular pattern of beeps which you are getting mean.

May 17, 2008 | E-Machines eMachines Desktop PC

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