This morning when powering my laptop after it being on sleep mode it did 7 successive beeping noise in interval and did not boot, after a few try it finally booted without noise. I am concern that something may go wrong very soon what should I do?
Seven beeps is a processor or mainboard failure - since the CPU is a permanent part of the board, they're effectively the same thing on this model. Try a system reset -- power off, unplug, remove or disconnect the battery, and remove and reinstall the memory modules and hard drive. If the problem begins to re-occur, replace the mainboard/CPU. This will be covered if the system is under warranty - if not, it's a major repair and will likely run a few hundred dollars.