Hi.
A continuous beep from a laptop usually indicates that there is a problem with the system memory. Remove the AC power supply, turn the laptop upside down and also remove the battery.
Look for a couple of panels with philips screw heads on them. Remove the screws and lift the panels away. locate which panel is hiding the memory. The memory looks like this >>>>
Take them out and clean the brass contacts and also remove any dust that may have built up. If you have more than one stick of memory installed clean them both and put them back one at a time to check whether one of them is faulty.
Chances are the memory is ok and have just been slightly knocked out of place but some memory modules do develop faults.
If there is anything else I can help you with please post back.
Good luck.