laptop memory replacement problems

[swalerroe7ab]

I have just attempted to replace the memory in a Dell Latitude 1501 from 1 g to 2 g. Now the system won't run it just shows the middle light "A" blinking and nothing else. What did I do wrong? I tried to put the old memory back but the same results . Please assist me with the  trouble shooting  steps I might be able to use. thanks

[nickc1976]

I presume you mean the RAM? Try booting the laptop without it - what hapens? When you say the system won't run, does it go through any of the boot up procedure?