OK, I've created my user, I read all the post like: "Sticky: Please READ this before posting!" and the recommended post.

This morning I tried to upgrade my Debian Wheezy to Debian Jessie. I took a while to read the release-notes, change the source.list typing "jessie" in order of "wheezy".

Then, I opened a script with:

# script -t 2>~/actualiza-a-jessie01.time -a ~/actualiza-a-jessie01.script

and, finally:

# apt-get dist-upgrade

The installation started and all was go on until the postgresql when the installation stops and there was nothing to do. A lot of time after I decide restar the computer but now it doesn't start.

Appears the Debian 8 start menu with:
GNU GRUP versión 2.02

And the menu options:
Debian GNU/Linux
Opciones avanzadas para Debian GNU/Linux
Memory test (memtest86+)
Memory test (memtest86+, serial console 115200)
Memory test (memtest86+, experimental multiboot)
Memory test (memtest86+, serial console 115200, experimental multiboot)

When I select GNU/Linux I only get:
Loanding, please wait...
fsck from util-linux 2.25.2
/dev/sda1: clean, 619892/30269440 files, 68856006/121052672 blocks

and then.... nothing.

What can I do to restore my computer?

Thanks in advance.

Opciones avanzadas --- I assume that's a foreign language equivalent of advanced options. So probably select that and select the menu item for recovery mode. Which hopefully avoids the black screen by not booting X. You can also type "e" on the menu item and edit things before you boot that option by pressing F10. If the root=... contents do not match what should be, you can change that to something like root=UUID=... which better at finding the root fs when you have multiple disks / devices.

I normally get a black screen if I have a proprietary driver manually installed and the kernel updates. The new kernel lacks the kernel module for the proprietary driver in that instance and needs to be re-installed. Booting to the non-gui / CLI option allows you to do that re-installation step of your manually installed driver. All of which assumes a certain level of familiarity. You can most times avoid this type of issue by using the package for the proprietary driver supplied by the distro. YMMV, and this may not be your issue(s) at all.

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Yes, "Opciones avanzadas..." is "Advanced options" but in spanish, I thought was obvious.

I started using all the diferent options one by one because in "Advanced options" entry was 6 different entries 3 for 3.2.0 version an another 3 for 3.16.0. Sometimes the blackscreen appeared before one text and others before other text.

At the end, in recovery mode a terminal session was open and I wrote the earlier sentence: "# apt-get dist-upgrade" and start to installing again and now is working properly.

Be careful with postegrsql upgrade.

Thanks