Hi,
RAM absolutely matters and I think you could slowly seeing the effects of trying to use non QVL RAM with your board.
Stick to 1 or 2 sticks (while testing) for now. The H97 is not tri-channel and memory should be installed in pairs for best performance (and compatibility). In the end, buying QVL RAM can save a great deal of time (which is money).
Might be helpful if you tell us what port you have the drive plugged in to and what controller operate mode you have selected. I know you're having problems entering BIOS consistently.
So you are booting (trying to boot) from a USB stick with a Ubuntu image?
What USB port are you plugging in to? What about your keyboard and mouse?
Start here:
Please CLR_CMOS or perform a battery pull. Lets ensure you are truly starting with a clean slate.
1 stick of RAM in DIMM 0
Disconnect your HDD
Connect keyboard, mouse to USB 2 ports (if applicable)
Start machine, press DEL key to enter BIOS (tap, pause, tap, pause) after you start the machine.
MIT heading
Memory
Set your memory timing, voltage, etc. manually (Consult the G-Skill website)
Save settings and exit.
System will restart
You should be able to restart and enter BIOS consistently at will.
If you cannot, there is no need to go further
Buy the correct memory for your board.
If you are successful, re-enter BIOS and set the operate mode for your controller, and ensure the port you are using is correct for the HDD. Save and exit. Power off, connect disk. Once again you should be able to restart and enter BIOS consistently at will.
Ready for Ubuntu. Insert stick, start machine, press F12 at POST, tap, pause method. Select your boot device from the one time boot menu. If you can't get this far... see the previous step... buy the correct memory for your board.
Hope this is helpful