My PSP GO was bricked!
What can i do to repair it(Blue screen of Death)?
Flash0 / font accidentally deleted :(
Complete repair manual for the PSP Go, including battery upgrade and display repair instructions.
If you are actually running a CFW on the PSP, than you should be able to boot it into recovery mode holding the right bumper, while turning it on. If you were using a HEN, and don't have a CFW installed, then you are kinda stuck with a brick, and might want to consider selling it for parts.
*EDIT* If you are using Custom FirmWare (CFW) and can boot the PSP into recovery mode, using the method above, and you can scroll over to Advanced>Toggle USB (flash0), connect it to your computer via USB, and replace the font file you deleted.