Have I damaged my iMac with notched RAM upgrade attempt?

i have a 21inch iMac, mid 2011 2.5ghz and decided to upgrade the RAM from 4 to 8gb (2x2 to 4x2) as this was supposed to be very easy (and only cost £35 or so from MrMemory) The problems started with getting the new RAM module in - basically I couldn't! Watching videos and reading instructions said it did take a bit of force, but I was really forcing without the module clicking into place. That **** tape seemed to be stopping it from sitting right. After several hours of swearing the tape broke and now the modules seemed to be finally sat in the slots. Turned on. Nothing at all! No beeps, nothing! Taking out the modules, I read up that the pairings may matter, but after the cat jumped on me, I don't know which ones are the new modules and which are the originals! Thought I would try putting pairs in to see if i could at least get it going. But now I'm getting nothing but the dreaded 3 beeps. I've tried all,combinations of the 4 2gb modules. Looking into the iMac's memory bay, I'm wondering if all my forcing has damaged it as I see a few loose metal strands in the memory slots? Plus those tapes are in bits so I've had to use long nose pliers to remove modules. Has this supposedly easy upgrade been so badly botched by me, I've knackered my Mac??!

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