why havn't we yet heard of a story about a virus that burned out the whole hardware ?
Primarily because it's impractical for the same reason you don't hear about Linux or OSX viruses that often. The dependencies are fairly extreme, so the virus would only work on very specific hardware configurations.
is the OS protecting PC??
Defense mechanisms are in place, though not necessarily against malicious software. For example, if you've ever done any overclocking, you'll probably have encountered the situation where your processor overheats and the machine hard stops to avoid damage. That's a defense mechanism against overheating of the CPU.
Manually manging memory means, assigning every integer to memory by typing its address by the programmer.
That's not how it works, unless you're targeting a specific address like old DOS' real mode VGA locations. More often you're using the stack space provided by the OS and simply adjusting the stack pointer to reserve bytes for an object. Even in assembly language we don't manage memory in the way you've described unless our program is the operating system.
it is not possible what the H are you talking about.. this is -of course- hardware protected.. yes you can do some damage to for example the HD damaging MBR or VBR so it really doesn't work anymore (still can be fixed though just not by your average user)..
Perhaps theoretically when a CPU is overclocked and you have low-level access to memory functions and you can overwrite build-in protection from OS you can overheat it to do some real real damage.. however again why do you want to do this?
It is not a problem if it is a old PC or a new PC. Just wanted to know the theory.
If someone was able to erase the automatic shutdown part in BIOS and write a code to overuse the hardware probably it will work which is nowhere near easy
You might just as well say that setting fire to the motherboard wouldn't be physical damage, because the mother board could be replaced.
Also, the question was could the computer be physically damaged, and the answer is yes. What was done a few years ago could be done today. You might have thought that motherboard manufacturers would have been spurred into putting some elementary security precautions in place, but for the most part they weren't.
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