6.60 ME-18 - Nothing loads!

[agriasoaks]

Help!

My PSP 2000 was running perfectly with 6.60 Pro. I accidentally ran pro update, and since then nothing loads - not even UMDs!
PSP boots normally and shows the games in the ISO folder, but when trying to run them, screen goes black after the "PSP" vignette and nothing happens (it doesn't turn off, still on).

Then to mess things up a bit more, I flashed CFW 6.60 ME-1.8. Didn't help. I tried running Hellcat's Recovery Flasher, but it also doesn't load (not even through recovery mode).
If I take the memory card out, the UMD loads. Insert memory card, nothing loads anymore, but stuff in it can still be read.

I dunno what to do anymore, any ideas?

[El Guapo]

Format the memory card and see if that helps. Back up anything important on the card like games, music, pics etc. first then format

[agriasoaks]

Nope, didn't work.

[El Guapo]

Do you have another memory card?

[agriasoaks]

It came back to life now!

I formatted it through the PSP; then I noticed that it hasn't actually formatted (PSP would say "format complete" but the files were still there). Formatted it through the PC and put back only the essential files; then it worked.
Something is weird though: PSP keeps on saying I only have 3gb free on the card, when I actually have 7gb. It's like my PSP can't read the card properly (thus not loading anything or formatting...)

Well, I hope it keeps on working! I won't mess with it anymore

Thanks a lot!

EDIT:
Enable FUSA, stops, disable, works. Seems FUSA is the problem...didn't realize it wasn't compatible with 6.60 Sorry!