I have tried to sort a blackberry I have here, I plug it in it's in an endless loop
I have tried to update the software too, but it keeps rebooting i see the progress bar of the OS trying to load but then it just powers off again, sometimes the red light comes on any suggestions? maybe I think the OS may be corrupt?

Look at Is your BlackBerry Nuked - BlackBerryFAQ

thanks for the reply, the link does not seem to display anything though?

Go to blackberryfaq.com. In the first section is a link to the article, Is Your BlackBerry Nuked? Check it out.