This video will show you how to get to the safemode on your PS3 Slim model and also explain what the different menus are used for.The following in the menu

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Same but I didn't mount it using Irisman, but instead had to encrypt it with the Ps2 Gui or something like that which would convert the ISO To .BIN.ENC, rename the .BIN.ENC with the game's name, in this case Budokai Tenkaichi 3.BIN.ENC and paste that to the usb, and also paste ps2 classics launcher and another file which is on the video, I linked below with my other comment ;)
It just turn on and ,the first beep (im still keep holding power button) but only turns off after almost 40seconds. I did it again and the same thing happened hold power button beep once and then turns off, also i did it a few more times but no beeps just the first one that sounds when you turn on your console.
Install both PKG's. Open up Multiman, and let it install/set up. Once it's done, you can choose what back-up to play (you can google how to get these, legit or not). After choosing a backup, it'll boot you back to XMB, with a 'disc' inserted. This is Multiman telling the Blu-Ray drive that there 'is a game in it'.
Step 3: unleashing the Super Slim hard drive. The Super Slim PS3 has a similar, but slightly different, hard drive style. First you need to remove the HDD plate, which makes up the right side of . 406 28 315 174 292 26 497 268

how to open ps3 super slim