I couldn’t find the beep error codes for your computer. None are listed in the user manual or the hardware manual. The closest that I found to what you said was for Lenovo ThinkCentre computers where a 2 Long, 3 short beep error code means a video card or onboard video problem.
The hardware maintenance manual for the computer doesn’t show that it has a separate video card so it must use the GPU that is integrated in with the CPU i.e. onboard. The problem may be on the motherboard (see p.20 of the manual -POST error codes)
Since the computer is fairly new it will still be covered by the manufacturer’s warranty. I suggest that you contact Lenovo customer support about the problem before the warranty runs out in case it is a motherboard problem.