Blocking Hi, my laptop blocks some times.... He has been to ACER for a few times and they say all the time, we change this and that, but it's never solved... He sometimes even blocks in the booting of the bios... so it has to be some hardware problem... can someone help me?

Have you ever try to change the RTC battery? (Real Time Clock)
battery..this device save your computer information,about the BIOS and CMOS
(BIOS=Basic Input and Output Circuit)
(CMOS=Complementary Metal Oxide Semiconductor)
This battery help to save all the information of your system,including the hardware,the hour and date etc.
Another thing that you can try is to check your hard disk, I change one yesterday to the laptop of a friend and is running like a new one.Even when I check the hard disk with the check disk application and appear that didn't have any problem.But the computer was freezing and took to long to make any command.
Try this two things and let me know.