Re: 3 out of 4 USB ports are not working Dell15R SE 7520

Hi Tamerlan1991,

Thanks for providing us this information. As earlier 3 USB ports were not working and now 2 of them works it seems like an issue with the Windows unable to detect USB devices.

Before getting the motherboard replaced on the system I would advise you to do clean re-install of Windows using the DVD. Please check the link below for performing the same:

Windows 7: http://dell.to/15MYHsz

Windows 8: http://dell.to/17qnyno

If you don't have the disks available please request them at the link below:

http://dell.to/Zj7oHA

And, if the system is under warranty we would be able to arrange the motherboard to replaced on the system.

Keep us posted with the results so we can advise you further.