Hello again, I removed one of the RAM sticks and tried to start the PC. The diagnostic lights were 1, 2 & 3 but thanks to your post highlighting the diagnostic indicator page I was not too worried and just followed the instructions on the screen. I then powered down and reinstalled the RAM stick, The computer powered up and reconfigured itself a couple of times and I could use it.........albeit it at a slower speed than normal. We had a thunderstorm and a power cut here and when I powered up again it started straight away and at the normal speed. Thank you so much!!!!!!!!
When I try and start my computer it will stall at the black screen with Dell logo and the purple progress bar is only at about 15%
optiplex 760