Sounds like a bad hard drive, or the hard drive may not be connected correctly. If you have recovery disks, you can replace the hard drive and reload the system. If you do not feel comfortable with this, I would suggest you contact technical support in your region, to inquire about repair.
It’s time to recognize brummyfan2 for his dedication and collaboration. Please join us in welcoming brummyfan2 to our ACE Team! brummyfan2 has been a valued member of the Acer Community since 2013, eagerly helping users troubleshoot their products.