Fan Races Computer Won't Start

Sounds like your governor linkage and or governor control fan arm " most small engines have them to control over speed" is binding or maybe has dirt and grass built up.. Or the return spring is disconnected. Once it starts to race manually move the governor linkage back an let go see it it stops racing.. Then release if it races again..check the spring if connected...you must check the governor fan it is located under the top housing..it uses the engine fan calling air to slow the engine when over speed occurs by pushing the governor linkage back to slower speed.. Check it out...good luck..

Sounds like a major vac leak, such as the EGR valve.

coolant temp sensor tells the computer how hot or cold the engine is so it can regulate the idle and fuel mixture, when it fails there usually is no cooling fan and you will have trouble starting the engine and keeping it running.

Normally, when the fan gets loud and races, it means that the CPU is getting too hot. The normal fault is that the case and ventilation block on the CPU is full of dust.

Disconnect the tower and take it outside or somewhere where a bit of a mess isn't a problem. Open the tower and look inside. Is it full of dust?

Using a dry soft bristle paint brush, CAREFULLY liberate any dust and fluff, if you have a hoover, brush to the hoover to remove dust.

The CPU is under a big metal blob with a fan on the top, Underneath the fan there are a load of ventilation duct in a metal block. See if you can clean them out, compressed air in a can is a good way. In conjunction with the brush.

Check all the vents and fans are clear of dust, including the PSU.

Once done, try it again, does it still race / lockup / close down.

If so, then you may need to renew the heat dispersal grease which is placed between the CPU and the Heat sink (Vented metal block under the fan).

The best place to find how to do that is look on Youtube for CPU changing / fitting / upgrading.

It is normal to have that but you should try checking if there is a dust on the fan of your computer or try checking on wjat application are you running that makes your computer seems to be racing.

Any unexpected shutoffs are caused by a power supply issue.

This video should help you. If not let me know and I will look for more options.
http://www.youtube.com/watch?v=Ed5VJqO21ns&feature=related

the fan is supposed to speed up when the processor gets too hot, then slow down after it has cooled a bit. if it is running more than normal, maybe you should take the cover off the pc and clean the dust out of the cpu heatsink.

If you put it in another T23, Windows will recognize the hardware change and ask you to re-activate Windows. Microsoft may or may not require you to pay for Windows again.