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Re: Fan does not work.
Two things...one the fan only workk when the unit get hot or you created short the inversters are very sinsative and if you make mistake you are dead...see try it for ferw min and see...but first try to reset the unit and that by disconnecting the negative and positive from the back and turn the unit on to get all charges in the unit out then reconnect the cables do not forget to ground the unit to avoid sparks.
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Okay, here is a quick test for you to try.
Unplug the fan and hook a testlight to the plug in and see if you have power going to the fan.
If you do have power, then the fuse/relay for the fan is good.
If you dont have power, then the fuse/relay for the fan is bad. Replace fuse or relay.
To test the fan, unplug it and hook a wire from the negative battery post and a wire from the positive battery post and touch negative to negative and positive to positive for the fan.
The fan should come on instantly. If not then the fan is bad.
If it does come on, then your fan is good and you must not be getting power to the fan.
check the fuse or relay and replace.
Grinding noise in tower If everything on your computer is working fine then it is probaly a fan put your ear in the back of your tower near the power cord and see if you can hear the grinding noise better if you can then your power supply's fan is going out if not its probally one of the inside fans in your tower open up your tower and see if you can find which fan it is if you dont want to do this you should probaly get a tech to look at it it's a pretty cheap fix and it can save your computer from heat dammage
You may need to reset the SMC. Unplug all cables from your iMac including the keyboard, mouse, power cable, DSL, everything. Wait at least 5 minutes. Now plug the power cord in making sure not to be pressing the power button at the same time. Connect all cables and press the power button and start your iMac. If you still hear the noise then take it in for service.
MOTION NOISE OCCUR IN THREE WAYS
1. The bearing of the fan is not good, apply greese or lubricant oil on bearing as on manual
2. The fan blade is not fixed properly, tight all screws, some times its blade is bent correct it.
3. The fan is operating on square wave frequency when it is working on an invertor, use a sine wave frequency
The noise you are hearing is due to the fan. The fan is used to cool the magnetron during cooking, and because this fan is not working the magnetron is overheating and the thermal protector is opening, killing power to the unit. All you need to fix this is a new fan blade. The fan blade(look for part #80) is slipping on the motor shaft ( the noise you are hearing).
trumpjd, Usually on startup the fans work a little harder then slow down. On newer computers they still have noticable fan noise. Most of what ou hear while the machine is running after start up is the power supply fan. When it starts to go bad you'll hear it all the time. randy320sgi
One of three things; 1- when the fan codes on some IBM's, the code locks in the bios, there is a download the has to be ran in order to clear the code and the machine to run properly. Check IBM's support site to see if this is the case for your machine 2- If the machine overheated in the process of the fan going out, then the processor may have been damaged, causing the problem and 3- if there was a malfunction with the motherboard which initially caused the fan to stop working, a new fan won't work either. Test the old fan by hooking power up to it, it is power direct and has two leads positive and negative, when power is applied it will run or not. If it does run then the problem is with the motherboard. Try these and get back to me.