It sounds like you didn't fully seat one of the RAM sticks. I would try
again carefully inserting them with firm pressure. It does take some force.

--
--DaveW


"peter" <solvino@googlemail.com> wrote in message
news:97bcbd0e-0b43-49ad-810d-a7f2816780d6@d77g2000hsb.googlegroups.com...
>A week or so I posted a message about upgrading the memory and the
> replies were very helpful. I bought some memory online and opened up
> my PC. There were two memory slots and one was hard to get at as the
> video card was in the way. So I took out the video card (carefully)
> then popped out the two memory cards. Then I realised that I'd bought
> the wrong memory card!! Silly me, never mind I'd only lost a few
> pounds, so I put the old memory cards back and the video card.
>
> Trouble is that the PC now doesn't work:
>
> 1) PC starts up and you hear the drives start to turn
> 2) There is nothing displayed on the monitor
> 3) The PC gives three long beeps, pause, three long beeps etc etc.
>
> I don't understand what I could have done wrong taking out some memory
> and video cards and then replacing them.
>
> How can I get my PC back?
>
> Any help warmly appreciated.
>
> Peter