You can't count on Win7 to start when moved to different hardware without SysPrep to move HD to another computer.
I'd instead try booting the Win7 installer for the licensed version on the Acer to Clean Reinstall - Factory OEM Windows 7.
If it fails test the HD using maker's HD Diagnostic
extended CD scan followed by Disk Check
run from installer System Recovery Options
Command Line, on a full disk partition created in installer or using Step 2.2 here: SSD - HDD Optimize for Windows Reinstallation.
Check for newer BIOS update. If none reset BIOS to defaults, set SATA controller to AHCI to try install. Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS
Test your RAM - Test with Memtest86+
for 5-6 passes. Remove all but 2gb RAM to try install, swap RAM sticks, check for debris in slots.