My Dell Latitude D830 will randomly give off a beep sound when powered on. There is no particular time that it will happen. What is the cause and solution? Thanks

Start the computer in safe mode. See what happens.

are any lights lighting up?

This is mostly caused by processor failure test your processor on another machine

1. Make sure you are plugged into A/C.. Your battery could be running low.
2. Make sure there is nothing blocking the heat vents. This symptom is typical for overheating processors.

those windows sounds are adjustable

start
control panel
sounds icon

look for windows sound settings find the one that says beep and disable it

Hello, Sounds like you either have a spybot or virus. When you power up your laptop immediately start hitting the f8 and go into the safe mode and check for viruses. You need to put malwarebytes on it and clean in safe mode. Here is website for malwarebytes.This is free and works.
Internet Security Product Downloads

Either that or the battery is near the end of its life and when a big spike in current is needed it fails so the voltage drops and the processor chokes, instantly shutting it down.

Probably. Look for a replacement battery on eBay. I have threee d600s and about a year ago I bought aftermarket batteries on eBay that work fine for about 1/3 the cost of a genuine Dell.

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http://www.user-guides.co.uk/download/dell/delllatitude/dell-latitude-d830-recovery-partition.html

If you haven't got the recovery disk that your computer came with then this should help.