I would set a baseline.
You say 2nd impact does not install and hangs.
- Does anything else install fine?
- Can you confirm 3s installs fine?
- Are you using a fully populated cps3 that's known to work previously?
- Do you have a darksoft super/ultra bios cart installed?
- Are you using the correct cd rom image?
- Do you have a custom or standard SH3? I'm assuming you have a standard if you're wanting to use 4th strike.
But first and foremost, confirm you can write another game like 3s because that's the only game that uses 6 sockets and if it writes fine, then you have an operational kit (ie. your baseline). If you can't write the game, then maybe it's worthwhile cleaning your simm sockets and simm pins then try again. If you still can't, then maybe worthwhile writing a new disc and check that or maybe even your disc drive is faulty. There's plenty of different variables, you just have to do a process of elimination. Maybe a faulty scsi cable too?
Once you have a baseline, then you can go from there.