MS surface pro 7

My surface pro 7 got stuck on windows screen 

I tried all the suggested internet remedies

Took it to my usual technician 

He used a usb drive reboot 

It says that there is no hard disk! Insert one 

My technicians say we can try to make the hard drive  rework but success rate is small

But it is a soldered one and can be replaced

Is this correct? 

Pl hep 

Thanks in advance

Dr B Krishnamurthy

Chennai

India