What zeebra suggested, you did not follow correctly I'm afraid. For example, in '/home/user/.xsession-error' user is your username which is 'syd' from your output, and '.xsession-error' is a text file. To read it's contents you can use 'less' or 'cat' ('less' will allow you to scroll while 'cat' will dump the contents on screen. To get out of 'less' press 'q')
syd@syd-Aspire-V3-571 ~ $ less .xsession-error
syd@syd-Aspire-V3-571 ~ $ cat .xsession-error
The '~' above shows that your current location is your home directory (/home/syd). '/home/syd/.xsession-error' is the absolute path of the file '.xsession-error'. Also these are separate commands, type one at a time in your Terminal:
dmesg > dmesg.file
glxinfo > glxinfo.file
In the first command 'dmesg' will show you messages generated by kernel, '>' will redirect the output (lot of text) to a file 'dmesg.file' rather than to your screen. This will be useful since you can attach that resulting file (dmesg.file) to your post. Same goes for 'lspci > lspci.file' and 'lsmod > lsmod.file'.
If you want to look for '/var/log/Xorg.Oconf' then it's inside '/var/log', you can change your current directory to that by:
syd@syd-Aspire-V3-571 ~ $ cd /var/log
syd@syd-Aspire-V3-571 /var/log $ ls
See how your current directory is changed from '~' (your home directory) to '/var/log', in the second command. Now you can see what's inside that directory by issuing an 'ls' command. Try to find a file that starts with 'Xorg.0.' (Xor.0.log most probably is the one you want). See it's contents for some errors.
Note: Some commands like 'dmesg' are not be run by a normal user so you have to add 'sudo' before the command (sudo dmesg), and just type syd's password when prompted.