Now my P750DM-G will post, but won't boot?

Ahh okay, @Stooj, I guess I thought it had something to do with a PCI Express SSD interface or something. And @Meaker I'm guessing it's not (yet) possible to boot off PCI Express? I think I've disabled network booting for now, although if I need it in the future I'll re-enable it.

I actually haven't gotten as far as installing the OS yet, although I have made some progress. At first, I was getting "Reboot and Select proper Boot device or Insert Boot Media in selected Boot device and press a key" when attempting to boot off anything. This wasn't just the external SD card (on which I'd used YUMI to put several Linux distros), it was also the internal hard drive. On the HDD, I had plugged it into my desktop and cloned the SD card onto it.

I went in and turned off UEFI, then was able to turn off the boot logo (idk why the option was greyed out before). I also changed the boot order to select the USB card reader first. THEN I was able to finally get into the syslinux boot options, then try booting various Linux distros. (Also using F7 to bring up the menu would boot off the card reader, whereas previously it would refuse to boot.) I'm thinking, if UEFI secure boot makes it so I can't boot 3rd-party OS's (besides Windows), I'm leaving it off. I have it disabled on my desktop PC, although I still have the UEFI "pretty" bios. My laptop doesn't have the eye candy, it's an older style looking bios.

So I was able to try several Linux distributions, and so far I think my best bet is Lubuntu 15.10 desktop AMD64. Test results of some other distros on the laptop are:
KXStudio 14.04.2 64bit, Zorin OS 9.1 Core 64, LXLE 14.04.3 64bit - no sound plays, resolution maxed at 1024x768
Lubuntu 14.04.3 desktop amd64 LTS (this would also have been one I would have wanted to use, as I prefer LTS), Linux Mint 17.3 cinnamon 64bit, Ubuntu Studio 14.04.3 LTS amd64 (I kinda wanted to use this one because of my main uses for the laptop) - black screen when trying to load GUI
PCLinuxOS64 KDE Fullmonty 2014.12 - "no default or ui config directive found"
PCLOS64 KDE MiniMe, LXDE, Mate - gets to install screen, but no live option, didn't proceed farther.
Porteus LXQt v3.1 x86_64 - kernel panic
PuppyLinux Slacko64 6.3.0 - had to use console trickery, but does start booting, but gui totally messed up.

Rejects, from having tried them in a VM on my windows PC previously include Linux Lite, Android x86 5.1, Chromixium 1.5, CorePure64, PuppyLinux Precise & Wary, Steam OS, TinyCorePure64, ReactOS, NanoLinux1.2.

So, now that I've for now decided on Lubuntu ... I go to try to install, and it squawks at me about a partition being in use. What? I hadn't booted off that hard drive, why is it locking its boot partition? So I ended up somehow deleting that partition - I think by plugging it into my desktop again, booting Linux off the SSD and deleting the partition. I then put it back in the laptop. (Somewhere in there I also deleted the other still-empty partitions - 144GiB ext4, 64GiB Swap and ~1.6TB NTFS.)
Actually, now I'm remembering that it's in gparted on the laptop that it complains about the partition on the HDD being in use, whether it's the clone of the boot partition from the SD card, or the swap, even when I turn swap off. And come to semi-remember again, I think it complained even with the boot partition deleted while swap was still on there.

Now, when clicking past the "Preparing to install Ubuntu -- for best results please ensure....." screen, I get "ubi-partman failed with exit code 10. Further information may be found in /var/log/syslog. Do you want to try running this setup again before continuing? If you do not, your installation may fail entirely or be broken.)

Any ideas what I should try next? I'm thinking, I have a 2GB SD card that currently has an older version of Ubuntu on it, although it won't boot fully, at least on the desktop. One thing I think I might try is wiping that SD card and "burning" my Lubuntu ISO to it using my desktop, but I'm not sure what program would be best to use. (I don't think I want to use YUMI for it though.) Then I'd try using that to install Lubuntu. Right now the internal HDD has 144GiB ext4, 64GiB swap and 1.62TiB NTFS partitions, but I'm thinking I should wipe them and start over. (I may need the desktop to do that though.) So far this time wiping them it didn't complain, so now I'm rebooting to see what happens next...

And, I still get the partman complaint. Guess it's time to make a new Lubuntu installer on that 2GB SD...

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Now my P750DM-G will post, but won't boot?