The AMI BIOS sounds normally when single 1 *long* beep at boot if all POST tests succeed.
However, 1 *short* beep indicates DRAM refresh failure.
you can check your RAM:
Click on the 'Start' button and type 'memory' in the 'search programs and files' list will open up.
select 'Memory Diagnostics Tool' follow on screen commands.
possibly the test result will indicate a possible RAM problem, I would suggest that switch of your laptop and dismantle ram clean it and the ram slot too and insert the RAM care fully.