my laptop didn't have this problem before though, it just started yesterday that when I turned it on it turns on a few seconds showing the laptop brand logo then turns off afterwards. I tried to fix it by removing the HDD and it turned on afterwards bringing me to the laptop's boot system then I just exited it and preceded to a black screen with press F4 note since it did not have HDD. but then when I attached the HDD and pressed F4 it successfully booted and started back to windows but after shutting down the system properly then turning it back on it occured the same problem again. I am aware my laptop has no battery as of now, the laptop has ever since run directly through its power adapter and it didn't have this kind of problem before, it just occured now. what seems to be the sudden problem of this?