Computer only briefly spins PU fan then nothing.

Hearing ONE beep is normal, and a signal that the computer hardware is OK.

Hearing THREE beeps is a signal that something is wrong:
* burnt-out CPU,
* one of the fans is not spinning (clogged?) or spinning too slowly (about to seize-up),
* one of the RAM chips is defective
* the video-card is not working

If there is more than one RAM stick, remove all but one stick, and start it up, to see if it starts.

Check that the fans are spinning freely.

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect your hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your motherboard to your hard drive make sure they have a secure connection and are not faulty or just replace them there probably old and faulty

hope this helps

power controller on the MB is corrupt...
may be a new MB can fix it...
check it with a tech guy

This is a difficult problem because I cannot determine the exact cause because of limited information.
This problem will need to be solved by trying one thing at a time.
Do not do all these together.
1. Reseat the RAM.
2. Remove the RAM and get it tested at your friendly computer store.
3. Reseat the hard disk
4. Run a virus scanning program on your computer/laptop
5. Check the fan to see if it spins freely, if not replace the fan
6. Loosen the dust from the fan and heat-sink assembly and remove/vacuum the dust.
7. Try removing the heat-sink, remove the old heat-sink compound and apply a new coating of heat-sink compound to the CPU and re-attach the heat-sink to the CPU.
8. Do a system repair with the Windows installation CD
9. If nothing works then re-install Windows, plus the laptop's device drivers and your programs.
You may need assistance from a computer savy friend to help you. Let me know how things work out.

1. Could be as simple as not having the Power Switch on the right jumper...double check.
2. The board will power up with nothing hooked to it... just power, CPU, MEM... disconect everything to just to get the board up to the bios.
3. Make sure PS is securly connected to the MB.
4. Check Jumper on the Board to make sure the Test Jumpers are not set
5. Memory is seated correctly... if you pull them out the board will start and beep...

The bare essentials to start a computer are PSU, Motherboard, CPU, RAM and Video.

Its possible the PSU arrived DOA. Though I've only had 2 DOA PSU's in the 15 years I've been building custom computers.

Hope this helps.
Mary

hi Dear,

You have to update your BIOS. If you have intel mother board just go thought their website and download BIOS Flash utility of your particular Board and Update BIOS.

The above fix will surely solved your problem.I had same problem as you and it's now fixed.

yes you can try checking the processor

Do not just check conductivity as some fans are speed controlled and you may have a sensor problem. see this wikipedia entry explaining various modern speed detection methods: http://en.wikipedia.org/wiki/Computer_fan#Physical_characteristics

well, if the powersupply whent, then everything is gone and you may need another fan. tis' the way of the powersupply. just try gettin g a new fan! now, does the computer start to boot when you try to turn it on with the fan not working? if it does, then that's good. if it doesn't, then try replacing the power switches in the case(or checking them first at least). hope that helps!