I installed addtl memory and the computer will come on but no screen

I jsut installed addtl memory to the 1.83 as only had 512 with the original purchase years ago...bought from Apple genius recommended Crucial
go the old out, added the new on the 2nd try as the new went in upside down from the old and according to the Apple demo, 2 sticks of 1 on the upper and lower areas...computer will now not come on..it turns on but no screen shows...what happened?

First remove the RAM and stick the orignal 512MB in, see if the computer works. It should fine.
Next remove the 512GB and replace with 1GB, see if the computer works, if so then
Install the second 1GB and see if it works,
If the first 1GB didn't work, then use the other and see if the computer works, if it does then install the 512MB in the second slot, if it doesn't work, you got a bad slot.
Document all your steps carefully, you have to determine which is the bad RAM module or if you have a bad RAM slot
One you can exchange, the bad slot your just out of luck. 

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