Cant get computer turn on

Thnks 4 you r advice but yesterday i turned it off safely. Ahhh i smelled the bad smell while i was using the computer. But do u know that i use my computer more than 15 hours a day. Plz could you tell me a detailed about it.. In the future i may dont have to face such problem!!!!!!!!

If you're using it 15 hours a day, you may want to invest in a better fan. Check for dust build up on your existing one, it could be gumming it up so it doesn't move.

@FrancisABoyd...
Thnks 4 the comment.....

No bro there's no dust in my computer. I clean it once a week. I tried to move it with the pen but it donot move. When i put the power cable to the power socket then the light of the mouse glows means it gets the power but the light of the cpu box(casin box) donot glows and when i press the power button then the fan moves slightly.....Just for milli seconds but donot make a round also........I would b grateful if u could give some suggestion.....

I think like I said above that you issue is due to an overheating. You said you use your computer over 15 hours per day, it is too long for a computer unless you have a good ventilation which will evacuate the heat.

Read the FAQ below for more details about that:
https://ccm.net/faq/2947-cpu-is-overheating
https://ccm.net/faq/4534-cooling-system-choosing-a-fan

Best Regards!

Again thnks !!! But my computer is well ventillated. There are three ventillations in the casin box.....Is there pther way to fix this problem!!!!!