Greetings, I'm going to keep this "short" because I've just had 6hrs of things I've tried that didn't work. It would take to long to list them all. :-) I have a bunch of new SuperMicro servers. Installed 7.3 on it. Reboot and it hangs at: "Probing EDD (edd=off to disable)...ok" And by hangs, I mean there is NO response out of anything. No Caps Lock light on keyboard, nothing. However, if I let it sit long enough it will boot (once one sat for an hour before it continued on, most of the time it is closer to 30-40 minutes). If I boot into rescue kernel, it instantly boots. Every time. This is so puzzling to me. If I wait and let it boot, then check 'systemd-analyze' it says my boot time is sub 6 seconds (fancy new SSD's too!) and blame tells me that the longest section to boot was 3 seconds on the networking. Well, that is worthless because it just SAT THERE FOR THIRTY MINUTES!!! It obviously starts recording time after the hang. No matter the amount of logging I do or what debug mode I put it in, it prints "Probing EDD (edd=off to disable)...ok" then hangs, and EVERYTHING after that has nothing to do whatsoever with the reason for the hang. I have disabled just about everything I can think of from various online suggestions. I removed the quiet flag (duh) and I've turned off intel_pthread's and power states and ACPI and nomodeset and loglevel=7 and blah blah blah blah. Seriously, my string of crap tacked on to the grub prompt is getting rather absurd. (I boot into recovery, modify /etc/default/grub and run grub2-mkconfig to set the grub prompt; I checked and this is working to set the grub parameters). Still same result. Recovery kernel boots, the other kernel hangs. Fine. I will install a kernel from El Repo! I'll get a fancy new 4 kernel! Yeah. That doesn't do squat either. Want to know the thing most infuriating? A single box in the whole batch, shows this problem once every 10 boots or so. I can't tell that there is a stinking thing different. BIOS is exactly the same, configs, install, packages, everything. *shrug* Are there *any* suggestions at all as to how I can figure out what it is hanging on? Is there a list of things after EDD that I can just start disabling till I get a different result? Thoughts? Thanks! ~Stack~