Just shut your computer down for a few minutes and let it cool down, or not run a lot of programs at a time...
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First check that your TV has a PC input of not. There is a PC Input in newly built LCD's and plasma's attach a cable(monitor cable) from your CPU or laptop into PC Input.For details refer to your LCD/Plasma User Manual.
To add cores to your PC, you typically need to upgrade your CPU to a model with more cores, as cores are a physical component of the processor. First, ensure your motherboard is compatible with the new CPU, then power down your PC, unplug it, and remove the old CPU by unscrewing the heatsink and releasing the CPU socket latch. Install the new CPU, reapply thermal paste, and reattach the heatsink before closing up your case and powering the system back on. Finally, update your BIOS if necessary, and check your operating system to confirm the additional cores are recognized.
Check for dust around the computer and clean it, and also check the ceramic compound on top of the CPU. if the ceramic compound on top of the CPU than you need to apply new compound.Check your PC every 3 months to make sure its clean.
You need to check if you computer does not overheat. It's the main problem. You might want to check your logs to see if one of your applications causes your computer to stop working.
The CPU
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One of your ventilators is likely clogged. Download a tool to monitor the CPU and computer case temperature, like this [http://www.hardwaresecrets.com/page/download_overclock] or this [http://www.almico.com/speedfan.php one]. The case temperature (the lower of the two measured temperatures) shouldn't be above 40 C, the max CPU temperature for your CPU, you can find on the following page: http://www.hardwaresecrets.com/article/143/5 (click "Next" until you find your CPU type). What kind of CPU is in your computer, you can find out by opening the "Control Panel" -> "System" -> Tab "General" -> Subsection "Computer:" in Windows XP.
This depends on the laptops CPU.
More often it is the motherboard which determines the Memory which can be in a PC.
The MIPS (Millions of Instructions Per Second) is not actually a 'static' set like your CPU's default frequency or similar settings. It is a measurement of performance. You will need to use a benchmarking tool, such as SiSoft SANDRA or PiFast to benchmark it.
Commodore Computers for their PET PC (Based on a MOS 6502 CPU),Tandy for their TRS-80 PC (Intially based on a Zilog Z80 CPU), andApple for the Apple II PCs (MOS 6502 CPU).