Error: Can't recognize silicon ID for device 1

[Altera_Forum]

Hello, 

 I have create my own PCB with a cyclone III which I program in AS. My board have work for months without problem but since this morning I have the message "Error: Can't recognize silicon ID for device 1" when I try to program the memory EPCS16I8N.  I have change the memory. I have verify the value of the MSELs When i try to program Data stay to '1', nCE go from '0' to '1' and nCONFIG go from '1' to '0' during half the time.   When not in programming I have periodic signals on Data and ASDI. Is it normal ?  Does someone known what could be the problem and what to do for correcting it ?  Thank you.

[Altera_Forum]

What kind of programmer are you using, and does it work on other boards? 

 It may be the programmer has failed. This is especially possible with a certain generation of USB Blasters, if you leave them attached to a powered board without the usb port connected to a computer.

[Altera_Forum]

I'm using a Usb-Blaster and I have use it in JTAG mode since and I haven't a problem. 

 I have already see, the board don't work when when the programmer is connect without the usb port to a computer.   Is it possible the programmer is out of work only for a mode ?