When i turn my laptop

Do you have Windows? If the blue screen has an error message is a crash in the operative system. that's means that is something wrong with Windows. You need to write down the Error code: is an hexagesimal number with some letters and an explanation. Ex. Error code: 0000 x 004B6 HDD malfunction.
Without the code we cann't help you. Sometimes, the problem can be a new hardware or software installation or mabey a corrupted file.

Unplugging a computer during reboot is asking for exactly what you are seeing especially with early versions of XP and prior Microsoft operating systems. Why? Because the act of unpluging causes corrupted information to be written back to the hard drive thus creating a faulty reboot, BUT that is not the only cause. I'm gonna ask you if you are knowledage about whether or not the battery on the laptop is charged up or not. If you are sure that the battery is good, then remove the power supply adapter and the cable it used to connect to the laptop and then see if the laptop boots up more or less normally. If it does the it is very possible that the power supply adapter is going bad on you and should be replaced immediately before further damage is done to your system. It is also possible that the first few sectors of your hard drive in the computer have become defective ( more then likely due to unplugging the computer during reboots ). If these first sectors are defective then there is little recourse except to have a technician replace the hard drive but before doing verify that the computer can boot up with a bootable CD or DVD. If it can, then the problem is corruption of the hard drive or fautly hard drive but if it can't, then it is very likely you have a power supply or motherboard issue on the laptop. Replacing the power supply adapter shouldn't be hard but you should make sure you are getting the right one from a trusted vendor. If the problem is a motherboard, then is likely not worth the money to replace it. Replacing the laptop would be a better option then replacing the motherboard. With the slew of defective batteries in recent years, it might be of worth to remove your present battery and then try rebooting just to see if your symptoms change. If they do, your options should be obvious.