I cannot connect to pcsuite its displays to be disconnected

Hi Piyush,

The problem seems to be with your USB port on either end. If you use your USB port (PC end) rarely then there's a chance of corrosion/oxidization that has formed on the contacts. Use a little bit of WD40. First take a small piece of good thick drawing paper (the ones used by kids in class to draw stuff on).
Fold it in such a way so as to fit it inside the PC's USB port. Now apply a few drops of WD40 oil on the paper's folded edge and insert the paper gently into the port and rub it (IN-OUT-IN-OUT) action. Now try connecting your cable & handset.
Assuming that you have a frint panel USB connector and if its still not working then there could be a loose contact problem with the 4 pin USB motherboard connectors. Switch OFF the PC, remove the side cover and see where the wires go on the motherboard from the front panel.

VERY IMPORTANT: CAUTION, BEFORE REMOVING THE 4 USB PINS FROM THE MOTHERBOARD, WRITE DOWN ON A PIECE OF PAPER THE SEQUENCE THEY ARE PRESENTLY CONNECTED AS YOU WILL HAVE TO RE-CONNECT THEM IN THE EXACT SAME MANNER. A WRONG CONNECTION WILL CERTAINLY DAMAGE YOUR MOTHERBOARD BEYOND REPAIR. THERE ARE 4 PINS: Refer Diagram Below:

Remove the pins one by one, apply a little WD40 in the sockets of the black, square cylindrical sockets and place them back and restart your PC.

It should work now.