can i start my pc or is it caput ??

The meaning of that long beep depend on the BIOS maker.

You may have a "loose" card.
Shut down the computer.
Unplug the power cord and open the case.
Remove one expantion card and replace it in the same location.
Repeat for any additional cards.
Close the case, plug the power cord and start the computer.
One expention card may be faulty. In this case, that card need to be replaced.

You may have a RAM isue.
Shut down the computer.
Unplug the power cord and open the case.
Remove and replace your memory sticks.
Close the case, plug the power cord and start the computer.

Your keyboard may not be connected correctly or could be faulty.
With the computer turned OFF.
Unplug the keyboard and plug it back.
Power on the computer.

Try with another keyboard.

Electro
September 2012