Hello Alinos,

I would suggest a couple of steps which would help us isolate the issue. Please follow the steps mentioned below.

1. Releasing the flea power.
-- Disconnect all the external peripherals from the computer including the battery and the ac adapter and release the flea power by pressing and holding the power button for 5 to 10 seconds. Turn on the computer and check.

2. Run the Pre-Boot System Assessment (PSA / ePSA) Diagnostics. 
It runs the test on the hardware components of the computer. Run the test and check if it gives any error code. Note down the error code and update me with the same, would let you know the next course of action. 

Please try the steps and write back to us, would be glad to assist further.

Um... what's "flea power" ;-)

Hello Allan D

Thanks for the reply.

I have run the first test, it doesn't work, so i tryed the second test and it said my computer is ok.

I don't have time now for a new attempt, so I'll try it later and I'll write back later.

Best Regards

Alinos

Hi Allan D

So I have run the e-Psa test with my second try to boot the computer and the answer was:

"No problems have been found with the system so far.

Do you want to run the remaining memory tests? This will take about 30 minutes or more?

Do you want to continue?(recommanded)"

So I continued and after 3 hours, it was 100% completed and it said :

"Success

All tests passed"

And I didn't run an other test.

But the matter is I can't run the test on the very first boot because I can't reach the ePSA at this moment.

So tell me what is the next step, please.

Best regards

Alinos

Some information in regards to this - review the numerous posts about 7720 BIOS and BOOT problems use the Search for "7720 BIOS" and you will see that you are not alone with this issue.  On some threads DELL Engineering has finally stepped in because of the numerous complaints and they are now gathering information.

It Seems that BIOS Versions A11 and A12 maybe causing this issue as well as the issues with the BIOS being completely in accessible to some of us.

See this post en.community.dell.com/.../19486769.aspx

See this post en.community.dell.com/.../19482406.aspx

See this post  en.community.dell.com/.../19478980.aspx

As well as many others you are not the alone with this issue. 

Surprised that the all the Dell Reps haven't been made aware of this situation until now.. guess they have to wait until a lot of people start complaining before actually working one what others in the know have stated for quite some time. :( Sad very Sad.

Hello Alinos,

Try resetting the  BIOS to defaults. For more information on resetting the BIOS to the defaults, refer to the Resetting the System Setup (BIOS) to its Default Settings section. Try the step and check the functionality. 

Please write back for more details.

Hi Allan D

Thanks for the reply

Like you know, there is some bad issues with the A11 and the A12 version of Bios.

I tested to flash again the A12 version and I couldn't run the flash.

A Dell engineer is taking charge actually for my problem, he will respond to me today normally.

Before checking your advice, I just don't know what kind of Bios version I got originally. I might think it's the A11...

And I don't know if I can reset Bios yet, like I tested flashing again the A12.

I'll let you know the answer in time.

Thanks and best regards

Alinos

Hello Allan D

So my contact responded not to do anything on my computer for now and wait until Friday.

At this date (and maybe sooner), he will be able to tell me some new advice and I hope it will solve the problem.

Cheers

Alinos

Hi Alinos,

Please do write back with the end result. Awaiting your response! 

Hi Allan D

I don't have the result yet but I'll let you know about the end result.

I'm writing in the French Dell community too: fr.community.dell.com/.../737.aspx

But no answer from Dell there...

The other guy Gogo93, who has opened the topic, ran tests, same tests you brought to me,  with a technician support, and hasn't rectified the problem.

His 7720 is going to the Dell repair shop and they tell him, it'll be back in 6 days normally.

Gogo93 will let me know which part was changed in his laptop.

Regards