computer freezes at acer screen logo

Try and unplug the computer from the mains, take out the CMOS battery (or replace the battery) as this battery helps stores the memory on a PC motherboard, that is used to store BIOS settings and the reboot log of your computer. This should reinstate the boot as the battery and your computer should boot properly. If this does not help, then take it to an Acer tech, do not try to do anything with your computer, as you will damage it and corrupt the operating system.