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if the situation is following: if completely cool down, it holds longer and then shut off, then if you turn on right away, it shut off shortly. it means your fan has problem or fan flow path is stuck. if you can hear big fan running sound, it means the fan is running in max speed to try to cool...

The noise comes from the power adaptor or inside laptop? if inside laptop, it comes from power components which caused by over rate current due to some kind of short circuit. so the laptop motherboard will come completely dead if it keeps running

first of all, try to adjust brightness and function key to switch display, see if it works. if both not, try external monitor, if the display works fine. it means the LCD screen is out of order. then repair LCD.

never do that, when it freeze up, just hold down the power switch 5 seconds, the computer will be forced to turn off. this is a hardware function. if it doesn't work, it means the hardware has problem rather than the software system

try the following: first the F8 key to get into the starting advanced options, and choose the option (Repair the system) to get into the program that recover the complete system to the factory initial configurations. It works with dell laptops,

T4200 Dual core 478-pin micro FC-PGA T7200 CORE2 Duo Socket M 479-ball micro-FCBGA different generation and package I don't think you can upgrade it even though you can reach the CPU.

What is your power plan setting for the display off time and computer sleep time ? when it comes back, it displays resuming?

There are lot of reasons cause a computer slowing down. such as virus, system drive is full, or not optimized

big screen wouldn't be lighter