Fan not working properly on Aspire 5750G

Hello,
I am having a problem with fan in my laptop since monday. Every day happens the same thing to me. When I turn on my computer and start playing a game, after 2-3 minutes my CPU and GPU temp reach about 90degrees and it shuts down. After a short moment I turn it on and start the game and again after 2-3minutes laptop will shut down. But when I am turning my laptop on for the 3rd time I can immadiately hear how the fan starts working just after pressing the power button and feel the air coming out. Every day for 4 days already I have exactly the same problem - fan starts working after 3rd boot. After that the laptop can be on for even 6 hours without the temperatures not coming close to 80degrees even when hard gaming.
When I was upgrading my bios it was the only time I heard the fan working really hard, noisy and cooling very good, normally it just doesn`t want to work that good and just spins on average keeping 70-75degrees in stress, normally about 50.

I would be very glad if anyone can provide any help or hint about this issue or how to make the fan working always after 1st turning on.

Thanks in advance and sorry for my english mistakes.

I have the newest bios 1.21, windows 7, intel i3, 4Gb ram, nvidia gt 540m

 

You can possibly check if using RW everything would allow you to manipulate fan speed, however you'd have to manually set it after each reboot.

 

I have upgraded to unlocked bios where I changed fan speed to go max at 60 degrees, but even though it always seems like it`s exactly the same speed that doesn`t really cause temperatures dropping down.

I also want to add that i usd windows 7 ultimate x64

 

Hello once again,
I opened the laptop, the fan was pretty clean but thermal paste on cpu and gpu were very dry so I put new paste on it. Now I get lower temperatures on the beggining on startup, but the fan refuses to start working anyway which leads to overheating. When I`m not doing much the laptop works fine, but when I start any game the laptop will shutdown after max 3minutes.

The fan now doesn`t start after 3rd boot now. It will randomly start to work, but once it starts there aren`t any problems with it anymore.
Once I took off a battery from the laptop and the fan started to work immidiately. I don`t have the battery inside anymore. Sometimes when the laptop is nearly overheated and is about to shutdown there are audio problems and strange noise occurs.

Any help or hint about the issue will be appreciated. Thank you.

 

Is the laptop still under warranty?

If it is you should contact Acer- this doesn't look like a simple issue to fix.

 

So I sent my laptop to repair on warranty. Took them like 2 days to fix it.
The fan sounds different now, I guess they replaced it with a new one. They sent me also a new power supply.
CPU temps instead of 50-80 are now 35-60, everything works great.

Case solved

 

Hi,
I am having exactly the same issue with my 5750g, can you tell me if your new power supply is the same model as the old one? Maybe you can tell me what is the model of this psu?
Thanks in advance

 

Sorry for answering so late. Maybe it`s still useful.
They didn`t replace the power supply, it`s the same. They replaced all the cooling system inside it. However after 6 months of intense using the computer again begins to overheat. The fan works but it goes at the same speed all the time and after reaching 80degrees the computer is just slowing alot for a few seconds.