I just have ONE question left.
When I try the Diagnostics.. Nothing happends.
The screen is still blue as the sky today:-)

If it doesn't boot into Diagnostics, You're fairly done.
That is in ROM that should not be effected by a firmware load. Sounds more like the processor isn't happy.

Not sure if anyone asked, I wonder if you have one of the real old boards that had the hardware problem with a chip coming out of it's socket. Do a search here, it was a well documented problem, and the serial number range of the effected units are listed, so you can check against your serial number easily.

Thanks I will check it:-D

I cant find any info:-O on the loose chip problem

Here's the note from early 2004:

Check the serial number of your unit. If it starts with 983xxxx or lower, call one the following service centers:

Digitron Electronics
7801 E. Telegraph Rd.
Montebello, Ca. 90640
323-887-0777
(Attn. Simon)

M. Industrial AV
950 E. Orangethorpe - Unit H
Anaheim, CA 92801
714-992-0984
(Attn. Mir)

Service Hint Isseued : Novenber 1999

Subject : Impossible to operate
Applicable Model : WR-DA7
Applicable Model Service Numbers : 981XXXX, 982XXXX, 983XXX

Check the soldering condition or contacts between the IC socket and IC305 on the Main Board.

Phenomena:
1. Faders were fixed electrically and all function could not be operated.
2. Abnormal LED indication.
3. No LCD indication etc,.
Cause: Soldering crack occured by accident to IC305 on the Main Board.
Countermeasures: Remove the IC socket of IC305 carefully and solder the IC305 directly on the Main Board.
Note: IC305 and IC socket are not used in the serial numbers that are 984XXXX and higher. The function of IC305 is absorbed into IC300.

My DA7s serial number starts with 988*****

So the bad-solder problem shouldn't apply to your DA7. Back to the drawing board.

Thanks so much for all the help:-D

hmm. I have 8pin mini DIN to null modem adapter to PC and still I got the bluescreen. I have tried the diagnostic mode and the reset mode. I've even tried to upgrade it everyday since i got the bluescreen:-( Is it possible to save it?