[Solved] Swap trouble

Hi. I just installed latest version of Calculate 14 XFCE, in my Dell Inspiron 6400. I refer to this thread (https://forums.gentoo.org/viewtopic-t-812898-start-0-0-postdays-postorder-asc-highlight- html) because I have a similar problem.
In my case the swap partition has been installed from the beginning.

In the file / etc / fstab I can see as follows (UUID code is taken away from me on purpose)

_/ was on /dev/sda9 during installation
UUID=[...]       /       ext4    noatime,nodirat$
/home was on /dev/sda10 during installation
UUID=[...]        /home   ext4    noatime,nodirat$
swap was on /dev/sda3 during installation
UUID=[...]       none    swap    sw      0 0
proc            /proc           proc    defaults                0 0
shm             /dev/shm        tmpfs   nodev,nosuid,noexec     0 0_

Nevertheless, every time I turn on the computer and give the command "free", the result is 

_fran@calculate ~ $ free
             total       used       free     shared    buffers     cached
Mem:       1021868     714956     306912      64100      25992     451556
-/+ buffers/cache:     237408     784460
Swap:            0          0          00 swap_ 

and I have to reactivate it by imposing swapon. 

_calculate fran # swapon /dev/sda3
calculate fran # free
             total       used       free     shared    buffers     cached
Mem:       1021868     721212     300656      64232      26592     452400
-/+ buffers/cache:     242220     779648
Swap:      2047996          0    2047996_

Any suggestions about that? Thanks!

UUID is correct? Correct uuid you can see in <<blkid /dev/sda3>>

Or try adding without UUID.

/dev/sda3   none      swap    sw                 0 0

First of all thanks for your kind reply .
While working to follow your suggestions , I opened Gparted .
I clicked with the left mouse button on the swap partition .
The context menu gave me the opportunity to ACTIVATE swap. So I did .
Giving free command from the terminal this was the result

calculate fran # free
             total       used       free     shared    buffers     cached
Mem:       1021868     960092      61776     160328     116172     343208
-/+ buffers/cache:     500712     521156
Swap:      2047996        128    2047868

Well . While following a different path I may have accidentally reached the RESULT. But in any case, thanks for your valuable suggestion !