My Acer aspire laptop started taking 20 minutes to start the post process AFTER I replaced a bad HDD with an SSD and did a fresh install of windows 7. It's super fast once it finally shows the windows logon screen. But after it displays the bios screen then it goes to a black screen with a blinking cursor for exactly 20 minutes. It is set to AHCI mode in the bios. I have also tried booting without the battery and it still does the same thing.