All the DELL laptops boots very slow. The slow boot problem is both in BIOS and Windows. It freezes up that much that the movement of the mouse cursor is very difficult.This is not the BIOS problem nor the Windows, it’s the problem of the hardware. Oftenly, the USB port got broke due to the attachment of the data and power wire. This is the reason, why all the DELL laptops boots very slow. You should must check your USB port in order to repair the Boot Logo Struck. The USB port have four points ,if any one of these is broken and are joined with each other as shown in the image, then separate them. After separating them your problem is solved.