
No Power, no light
This would be quite a coincidence, but considering you are getting NO signs of power, you more than likely blew a fuse. Do a google search for psp fuse repair, and test the main power fuse - They're not hard to fix if you know how to solder.
...Seems highly unlikely that a screwed up memory card could fully brick your PSP. I'd suggest a semi-brick, but as you say that there are NO signs of life, I'd say the main fuse is most likely the culprit.
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