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Start by checking the fuses... If they're fine the start tracing the wiring from the fan. Look for any burn marks, pinches, etc... If in doubt I'd recommend taking it to a professional. It's really easy to mess things up if your not sure what your doing
the fan in your computer is constantly running to cool down the cpu and it is normal for it to increase it's speed, your fan should run quietly even it increases the rpm. But if you hear a loud noise in the fan, i think there's something wrong with it. I suggest for you to check the fan if it's coming in contact with anything. If the fan is visible while your laptop is operating, you can observe it to know what is really happening. I don't know what type of fan hp uses on their laptops, maybe something is loose already on the fan so better check it or bring it to a service center.
It sounds like the cooling fan is going bad.. when the cooling fan starts going bad it makes a loud noise and sometimes it doesn't even run. Here's the link for a fan for that specific laptop:
http://www.ebay.com/sch/i.html?_nkw=Toshiba+Satellite+L645D+fan&_sacat=0&_odkw=Toshiba+Satellite+L645D&_osacat=0&_trksid=p3286.c0.m270.l1313 Please let me know ifthis was helpful and if it solved the problem! Also if the information providedwas helpful, please click on the appropriate thumbs to make us aware that theproblem has been corrected or that the information provided helped you with theproblem.. Thank you and Good Luck.
Sounds like the fan is going out. I would take it back to the store and swap it for a new one. Alternatively, if you decide to keep it you can try to put a drop of 3-in1 oil in the center of the fan to prolong and/or fix the noisy fan.
The main fan that cools the lamp is mostly high speed when the unit is running. when it shuts down it slows the fan down, until it stops in standby. So the noise is only really loud when it is showing a picture.
try setting the fan to eco mode (slower running) and see if the noise is acceptable. If it is still too loud then you will have to replace it. Have a look at the fan and see if any of the plastic blades are missing.
The warranty should be handled by Sony. Check your documents, as some brands only offer 90 days, while stores sometimes have their own extensions for longer periods. Best Buy can also advise which one it is.
It seems your laptop computer is not cooled properly which might be beacuse of a broken cpu fan as you mentioned it makes loud noise.
The reason your laptop turns off by itself is because theres a circuitry built on the motherboard which power offs itself if the internal temperature raises, this is a safety feature to prevent your computer getting burnt.
Please avoid using your computer and take it to a shop where you can have it checked for cooling.
hope this answers your question