Quote from jackophantI don't know what you typed about your PSU or if that was an attempt at comedy (*whoosh* over my head), but hard drives are recoverable which you should really look into, even something as simple as a bay to run the drive externally and plug USB into slow laptop.
But for future reference, get the desktop app for dropbox/google drive and map from the cloud. The only thing it doesnt work for is instances (which have to be in the sdk_content folder for whatever reason), and then you are safe guarded against any sort of computer failure.
If you genuinely know the problem with your PC, I'm happy to try and help you with ideas to recover stuff. But if your flux capacitor has overcharged the feedback loop, I'm afraid I'll have to RC in, increase the resolution and hash your CPU.
Well, a hint. I have had some job done, from older version, since i loved the map myself. HDD is already out in the trash, but i have done some progress for the map. I might as well continue map, but right now im choking with another map. If i don't find the way to fix the middle for it, i will start doing de_oldtown once again.