Making a Mod
YESH, IT WORKED. Thanks man!
No problem 
Be aware though, that that corrupted entity is still in your map, right now it's just suppressed by the cordon tool. To get rid of it completely, you have to select everything (by dragging a rectangle around the whole map) and copy-paste it into a new file. That will permanently get rid of the problem.
(You'll copy everything except the broken entity, because Hammer can't determine it's size, so it isn't selected when you drag a selection box around the map.)
The only thing is that you'll need to re-create any custom visgroups. (If you don't know what visgroups are then never mind.)
(Oh btw the alt+P map check doesn't detect empty brush entities. Sucks.)
Other Portal 2 maps: Medusa Glare
Portal 1 maps: Try Anything Twice | Manic Mechanic
Why is everything black on my map, besides the wake-up bed and the aperture lab screen? All walls are entirely black and I haven't changed nothing int the lighting of the room!
Have you got any lights in your map at all?
I guess you have a leak.
(percentage calculation sphere self-test failed!)
108.1% done, -8.1% remaining...
Released here!
All maps for Portal (1/2) worth playing are mirrored here.
Yes, I have lights (light and spotlight).
How I find and fix the leak?
Load your pointfile, it will show you where the leak is.
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It's also possible you don't have a leak. If you originally had no lights in the map then it would show up as "fullbright" since vrad wouldn't have been successfully run. As soon as you add some lights and run vrad then every room that doesn't have lights will be very dark or pitch black. Is this what happened?
Portal 1: Portal Pro, Resurrection, Dyad, Rexaura
Portal 2: [Coop] Electrophobia, [PTI] EotM Collection, [SP] Aperture Halloween
I have lights on my room, so I'm quite sure that this isn't the problem, Mevious.
And I have feel questions:
How do I modify portal sounds (entering, exiting) for my Mod?
How I modify the portal gun and it's glow color of the last portal you shooted?
How I load the pointfile?
And I have feel questions:
How do I modify portal sounds (entering, exiting) for my Mod?
How I modify the portal gun and it's glow color of the last portal you shooted?
How I load the pointfile?
Replace the original sounds with corresponding custom files in your mod's sound directory. They have to have the same path as the ones in the GCF. Not sure where in the GCF they are, dig around a bit.
To modify the ASHPD (I assume you mean reskinning) extract the texture from the GCF--should be in materials/models/weapons/v_models/v_portalgun/ or something like that--and edit it. Then place it, once again, in your mod's corresponding materials folder.
Finally, some bad news on the ASHPD glow. One of them--the one closer to the player, if my memory serves me correctly--is made of two different colored sprites in the GCF. Extract them, edit them, and place in correct folder. The glow in the glass tube, however, is...a little bit more difficult. I say "little bit" because as far as I know it hasn't been done yet; I'm working on it right now with Omni. We might have something to show, as hopefully I can switch everything possible in Portal: Stay Inside over to green/purple (shameless self-plug there I know). We have a vague feeling that it stems from the same color values in the DLLs that control the crosshair (which we're still working on too, obviously, though Omni has provided a temporary fix).
Oh, and load pointfiles by going to Map-->Load Pointfile... in Hammer. If you have a leak, a window will pop up asking if you want to load the default one; if not a browsing window will pop up, in which case a leak isn't your problem.
Now with 100% more inline comments!
How I edit it? O.o
what program I use? What exactly files I need?