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.
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.
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.
cpu
The CPU
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.
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.
More often it is the motherboard which determines the Memory which can be in a PC.
I would ask myself if it is worth of effort. Three scenarios make a CPU upgrade worthwhile: Moving from a Celeron to a Pentium, switching to a version of your current CPU that's at least 50 percent faster than the one you already have, and shifting from a traditional processor architecture to dual-core. I would start by finding out which CPUs my PC's motherboard supports and chose the fastest processor my motherboard will accept. Then I would check the device's documentation and visit the manufacturer's Web site. It is important to check if BIOS is up to date and supports the CPU.
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).