Something is wrong with my laptop

[StillSilver :(]

Ok so today I started my laptop to do some work and it started beeping like crazy it never happened to me before so i thought a restart will fix it but it didnt so it landed me on bitlocker page while it was still beeping after i entered the password it stopped beeping and then on while starting windows it started boot looping but after 6-7 loops the computer booted into windows and it took forever to boot on windows and  when it landed on homepage the mouse started flickering and everything was so slow after like 10-15 mins I unplugged the power cable and now its working fine and its not the power cable because afterwards i plugged it in and it is still working fine and a few days before this my keyboard was freaking out not the USB keyboard the inbuilt keyboard I will really appreciate some help Thank You (Sorry for bad english my native language is Czech) again Thank You 

[StillSilver :(]

1 hour ago, Arika S said:

what is the model of your laptop?

how many times does it beep?

 

the beeps are an error code which can tell you what is wrong with it

Hi laptop is Dell Inspiron 15 3542 and it was a long beep dont know how may time it beeped it was annoying as hell