I have a Packard Bell ixtreme x6620b uk, which has just stopped working. The last couple of times, when I switched it on it said the PC was not shut down properly and gave me the option to start Windows normally, or in safe mode. As I thought I had switched off the PC correctly I just started Windows normally. However, this morning it is only producing a continuous whistling/beeping noise but nothing is being displayed on the screen. Any idea what could it be - graphics card, the hard drive or something else? It won't accept the system repair disc I created in the early days. Any suggestions would be much appreciated... Thank you.