Booting failure for Ubuntu in a dual boot system

Oct 18, 2016 5:40AM PDT

I'm facing a strange problem with my pc, which was recently rebuild almost from scratch. I've kept only an old hdd, the case and the power supply.

My computer has an Intel I5 6600 processor, 16 GB RAM (2xCool and an ASUS motherboard with an onboard graphics and sound cards.

I had firstly installed Windows 10 and then Ubuntu 16.04. For a couple of months everything was working perfectly well as expected. However, after that period and unexpectedly I could say, I've started facing booting problems. Eight out of ten times my computer couldn't boot. Immediately after the first beep, I was getting a dark screen. Neither motherboard logo nor GRUB was showing up, just dark screen. My monitor was connected to the computer via a DVI link.

I took my pc at my workplace and plugged it in another monitor using a VGA cable. It worked. I could boot both at Windows and Ubuntu as well. I also checked my computer with my TV back at home using an HDMI cable and it worked with it as well. Thus, I thought to use the VGA connection of my old monitor instead of the DVI one, hopping that it could work. It almost did! I was getting a monitor signal, GRUB was showing up, I could boot into Windows 10 but not in Ubuntu! I thought that maybe my Ubuntu system/partition was damaged or something and I had to reinstall Ubuntu.

I took my DVD disk that I had used to install Ubuntu 16.04 and I did a new install deleting the old one. After the installation and the repair of GRUB I managed to boot into the new Ubuntu installation. I did all the updates and reboot the machine and... I had the same problem again! I could boot into Windows but not in Ubuntu. I've also downloaded Ubuntu 16.10 and Kubuntu 16.10 (even another distro the Elementary OS) and none of the dvd's could start the installation or boot as a live CD! The only DVD that I can manage to start is the one with Ubuntu 16.04. The strange think is that everything works fine if I connect the pc with my TV (via HDMI). Today I took my pc to a friend who deals with pc problems and my pc worked fine (windows and Ubuntu) connected to his monitor! He checked my power supply and all the numbers were ok. He gave me to try another power supply and a graphics card (ASUS RADEON HD 5450). Back at home I changed the power supply and checked to see if it was working. Winows were working but Ubuntu not. I added the video card and… I can boot on both operating systems Windows and Ubuntu.

Is this a graphics problem and do I need a graphics card? If so how come my pc works with other monitors (tried in two different ones) and a TV and not just with my old pc monitor? Why Windows boot perfectly and not Ubuntu? Do you think it’s a hardware issue or an Ubuntu one? Is there a solution to fix the problem without buying an extra graphics card?

Sorry for the long message but I had to give you as much details as I could!

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I thing the TL;DR is "Video card problems with Ubuntu."
Oct 18, 2016 8:38AM PDT

So Ubuntu 16.10 is out, try that and other Distros. I find getting Linux video issues like this sorted is me waiting as I can't get into Linux drivers today.

My last run in with this was on an Intel NUC. It had some new onboard video system and Ubuntu at first didn't work but about a month later Ubuntu in a new version added support.

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So GRUB is not working becuse of...
Oct 18, 2016 10:58AM PDT

monitor issue. Very strange, never heard of that.

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Just for fun,
Oct 18, 2016 11:00AM PDT

how about installing some other distro.?

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Oct 18, 2016 11:02AM PDT

I picked up a very new version of the Intel NUC and ran into so many distros that didn't display for who knows why. As time passed more and more distros worked.

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