LED blinks upon switching on, system doesnt boot up!!!

I have HP Pavilion dv4 1225dx laptop
While switching on LEDs located near caps lock and num lock are blinking, without any beep sound. At the same time, the exhause fan runs. But the system doesnt boot up. The LED blinks continously, with out stopping. Time to time the system boots up and i was able to work normally, still with blinking LED signals.
To note, i dont see anything in the screen and i tried with alternative screen, but the situation remains...
I checked in the Hp support, which conveys the problem in the CPU. but I was able to login my system even after this problem.
So im not sure my CPU is having a problem.
Before this issue, there used to be a message while switchign on about replacing the internal battery. This i havent done yet. Im suspecting this issue.
Also, recently i cleaned the exhaust windows using an air gun.
Presently, My system is working on windows 8 OS.
 I hope to have answers to my problem
Thanks in advance

Thanks for the reply!
But how to overheat the system.
I tried leaving it on for at least 7-8 hrs, then sometimes it starts and not sure about all the time.
Moreover how to switch off the fan to overheat the system.
Anyway both suggestions will take time to switch on, is there any instant solution???
thanks in advance

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    Katja

    try this
    Solution number 1  
    http://blackberryfaq.com/index.php/How_do_I_wipe_t​he_BlackBerry_using_Jl_Cmder%3F
    Solution number 2
    http://blackberryfaq.com/index.php/What_to_do_next​_if_Jl_Cmder_will_not_connect_and_wipe
    Good Luck 

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