A single short beep simply means the motherboard is reporting it's OK so the hard drive is the one causing the stupidness. Let's try remounting the hard drive.
I'm making huge assumptions on how your laptop may function here. I own an ASUS laptop, but they're all different. What I am explaining is a general set of directions based upon my past experience working with lappies.
You may need a small philips screwdriver (looks like a +). Eyeglass repair kits are good for electronics.
Power off the laptop. Lay the laptop flat so the bottom is facing up. Remove the laptop battery. Disconnect power cable if applicable.
With the screwdriver, open the long rectangular slot cover on the laptop to reveal the hard drive. Laptop hard drives are typically encased in little plastic covering, screws, or held in with wee hooks. Gentily lift the hard drive, disconnect it from the laptop, and reconnect it. (While you're here, take a look at the hard drive and write down it's brand, capacity, and model number just in case.)
Close the lid of the hard drive seat and reinsert the laptop battery.
Power on the laptop.
See if it boots into operating system. If it still returns to splash screen and Bios, enter Bios.
Go to the tab which has boot options. Set the boot drive as "C". Leave Bios and make sure to save your changes.
See if the laptop boots into the operating system now. !! LISTEN TO THE HARD DRIVE AS THE COMPUTER STARTS. !! Healthy hard drives, even the little ones, should power on and make a smooth whirr. A few tiny clacks demonstrate that they are reading data.
Let me know how it goes.
