I have split your post away from the original thread
viewtopic.php?f=47&t=65677 as it's a) been a long time and b) it sounds like a different problem.
I have never used a T630 but as far as I'm aware it's exactly the same hardware as an R630 but in a tower case instead of a rack mounted one. I have done dozens of installs on R630s without a problem.
Here's what I recommend you try. First download the full CentOS 7.6.1810 DVD iso image - not the minimal or the Everything DVD or the netinstall iso images. Once downloaded, use a utility that can give you sha256sum calculations and run that against the iso image that you downloaded. Now check that that matches the list published in the 7.6 Release Notes
https://wiki.centos.org/Manuals/Release ... ntOS7.1810
If it doesn't match, download it again until it does (or use a bittorrent download which will reject pieces that are not correct and redownload them automatically).
Once you have an iso file that has the correct sha256sum, write it to a USB stick using a linux system and the 'dd' utility. You must write the iso image to the entire USB stick and not to a partition on it - e.g /dev/sdx and not /dev/sdx1 etc. If you think your USB stick may not have written it correctly then you can reverse the dd process to read from the USB stick and write to a disk file - you'll have to specify the number of blocks you wrote to the USB stick (which the original dd will have told you when it ended) to copy only those sectors that belong to the iso image. Once that's done you can then sha256sum the new file that you wrote by copying it back to make sure it has the same contents as the one you wrote to the stick in the first place. If you suspect you have a dodgy USB stick, try a different one.
Now boot from the USB stick. If it does not work then reboot and this time start by using the "Troubleshooting" option off the initial menu that you see and then use the option under that to install with plain video (I forget what it's called but it uses the most basic video mode available to avoid problems with video drivers). If that doesn't work, do it yet again and this time, still using the basic video option, hit the tab key while the basic video option is highlighted and it will let you amend the parameters passed to the kernel. Using the arrow keys find any mention of either 'rhgb' or 'quiet' and delete them before you press enter to start the install. Take a screenshot of what you see when it fails at that point and post it here.
The Dell iDRAC also keeps logs of hardware errors. Look in there and see if anything is being logged that might indicate a hardware problem. There are two different sets of logs, look in both for anything that might give a clue.
Is your machine set up to use legacy BIOS or UEFI/Secure Boot. Try changing that from one to the other. I use legacy BIOS on all mine.
You might also try downloading memtest86+ and writing that iso image to a USB stick and booting from that and leaving it running for the rest of the weekend to see if it finds any problems. Hopefully your T630 has ECC RAM so this won't find anything wrong (though the iDRAC logs might contain corrected ECC errors indicating that you might need replacements).
