The number of beeps means different things from different BIOS manufacturers. On a Dell computer, 5 beeps mean that the CMOS battery on the motherboard needs testing of the cell's Voltage. On other BIOS it would likely result in a failure to boot although the AMI BIOS says it is a “process failure”.I found that the laptop has the 5 beeps on that laptop indicating the CMOS battery needs to be replaced, and seeing as that is a 2015 model, the battery is 7 years old which is about the expected lifespan of a CMSO Battery. So ii understand this is caused because Real Time Clock (RTC) power failure. Try reseating the CMOS Battery and run the Dell Diagnostics if that does not resolve the issue