I bought my MacBook 2 month ago, and I used it everyday. But, like 2 days ago, my Macbook started to not turn on well. it takes almost a minute to turn on, and Macbook is saying that it did not turned on correctly. so I need to log on, and restart it to turn it on correctly.
when it was not turned on correctly, many bad things happened; 1, screen blinks for 1 sec when I log on. 2. it does not respond my mouse movement immediately, there is some delay, and it lags in general. 3. keyboard light does not turn on, which is quite annoying when using in complete darkness.

will there be any viruses or sth that cause my computer to do this? what should I do?
or is it just because I used it too much time..?