'Battery Alert' appears before the 'press 'ESC' key for Start-up menu.', however, ' Cooling Fan Alert' appears after 'press 'ESC' key for Start-up menu.'

I think replacing the CPU fan is the least expensive and first thing you should try.

I would not use paint thinner to clean the CPU, see if you can find that alcohol I mentioned (try a ****, doctors office, etc.)

Clean the CPU and heat sink using a cloth and the alcohol. Then use a fresh piece of cloth and more alcohol to remove any residue that your eyes may not be able to see.

Apply the thermal paste and then secure the heat sink so that there is no movement (not loose) and fan and then turn on your PC.

Thanks a lot,

Could you please read my points below and comment on each of them?

1- As said before, I have never ever cleaned the CPU or GPU surfaces with paint thinner at all. I have cleaned the old thermal compound by applying new thermal compound on the old to let it wet, and then removed the old by a fresh piece of cloth. I have only cleaned the fan/ and heatsink vents with paint thinner. 

2- I really have been never ever familiar with Isopropyl alcohol, although I googled it. But all what I found is information. However, even if I have seen it in the market I don't know if this is Isopropyl alcohol since it might that Isopropyl alcohol is called by another name in my local Yemeni markets. In which stores can I find it?

Firstly:

But if heat sensor is built into the CPU or sometimes an external sensor that is part of the motherboard,  and 

**If a new fan does not fix the problem then the problem,**then heat sensor would definitely be faulty. So, I will have to replace the motherboard or CPU???????.

Yes, check your CPU and motherboard specifications to see which or both.

Again look in the BIOS for FAN / Thermal settings if available.

Thanks a lot,

As said before, my BIOS has basic options, in which there are only virtualization can be enabled or disabled, and some other options, but  no Fan/Thermal settings can be set up.

What do you want me to see in my motherboard/CPU specifications? I only have general specs of my PC. There is no information about motherboard in my general Specs of my PC.

Product Name: dv6-6093ex

Product Number:LM610EA

Microprocessor: 2.3 GHz Intel Core i5-2410M

Microprocessor: Cache3 MB L3 cache

Memory: 6 GB DDR3

Memory Max Upgradeable to 8 GB DDR3

Video Graphics: AMD Radeon HD 6770M (1 GB DDR5)

Display: 39,6 cm (15,6") High-Definition LED HP BrightView Display (1366 x 768)

Hard Drive: 750 GB SATA (5400 rpm)

Multimedia DriveLightScribe SuperMulti DVD±R/RW with Double Layer Support

Network Card: Integrated 10/100/1000 Gigabit Ethernet LANHP Customer Support

I think if I give you these screen shots of my motherboard and CPU below taken by Specy program , you can tell me which specifications you want me to check to know if I  would want to replace the motherboard or CPU if heat sensor was faulty???????.

I think replacing the CPU fan is the least expensive and first thing you should try.

I would not use paint thinner to clean the CPU, see if you can find that alcohol I mentioned (try a ****, doctors office, etc.)

Clean the CPU and heat sink using a cloth and the alcohol. Then use a fresh piece of cloth and more alcohol to remove any residue that your eyes may not be able to see.

Apply the thermal paste and then secure the heat sink so that there is no movement (not loose) and fan and then turn on your PC.

Sorry, but I never received a notice of your post, which is why no reply.  Will get back to you tomorrow.

Could you please reply to my final post to finish this issue?

Firstly:

But if heat sensor is built into the CPU or sometimes an external sensor that is part of the motherboard,  and 

If a new fan does not fix the problem then the problem, then heat sensor would definitely be faulty. So, I will have to replace the motherboard or CPU???????.

Yes, check your CPU and motherboard specifications to see which or both.

Again look in the BIOS for FAN / Thermal settings if available.

Thanks a lot,

As said before, my BIOS has basic options, in which there are only virtualization can be enabled or disabled, and some other options, but  no Fan/Thermal settings can be set up.

What do you want me to see in my motherboard/CPU specifications? I only have general specs of my PC. There is no information about motherboard in my general Specs of my PC.

Product Name: dv6-6093ex

Product Number:LM610EA

Microprocessor: 2.3 GHz Intel Core i5-2410M

Microprocessor: Cache3 MB L3 cache

Memory: 6 GB DDR3

Memory Max Upgradeable to 8 GB DDR3

Video Graphics: AMD Radeon HD 6770M (1 GB DDR5)

Display: 39,6 cm (15,6") High-Definition LED HP BrightView Display (1366 x 768)

Hard Drive: 750 GB SATA (5400 rpm)

Multimedia DriveLightScribe SuperMulti DVD±R/RW with Double Layer Support

Network Card: Integrated 10/100/1000 Gigabit Ethernet LANHP Customer Support

I think if I give you these screen shots of my motherboard and CPU below taken by Specy program , you can tell me which specifications you want me to check to know if I  would want to replace the motherboard or CPU if heat sensor was faulty???????.