Sony VGN-NW130J booting problem

[caspian]

Dear technicians,

I have a Sony VGN-NW130J with a faulty MBX204 mainboard. I have replaced the mainboard by MBX205 that belongs to Sony VGN-NW70JB. The two mainboards have the same chipset and are fully compatible. Now, everything works fine with the new mainboard except for booting.
When I connect the old harddisk, the laptop says: "no operating system found"
I entered the Bios settings, it detects the harddisk and CPU and it can save time settings. But when I change boot order in Bios, it is not saved and returns to default.
In the default boot option, the DVD-Drive has the highest priority then the next priority is the internal harddisk.
what do you think is wrong that this laptop cannot boot?
1- Booting Priority order ?
2- MBR of Harddisk ?
3- Mainboard ?

note: the hard disk was bootable with the previous mainboard.

thanks

[mcplslg123]

Re: Sony VGN-NW130J booting problem

If both mb are fully compatible as you have said i'll prefer to swap bios chip and see if it makes any difference.

[caspian]

Re: Sony VGN-NW130J booting problem

the only differences between the two mainboards are:
1- mbx204 had graphics chip, but the new mainboard does not.
2- Bios contents of the two mainboards are different.

Is it normal that boot priority in bios cannot be saved in Sony Vaio laptops?
When harddisk is the second priority, does the laptop tries booting from harddisk if the first priority device is not bootable?

[mcplslg123]

Re: Sony VGN-NW130J booting problem

No its not normal. Yes it should boot from 2nd boot option if first option is not exercised.

Still i beleive you should try swapping the bios.

[caspian]

Re: Sony VGN-NW130J booting problem

Since the mainboard is under guarantee, I could not solder the Bios chip. I tested that Laptop does not even boot by DVD and flash memory.
I talked to the seller and he said: we had the same problem previously. we reprogrammed the Bios chip, but it did not solve the problem.
Then, he said: send the Laptop to us so we will replace the mainboard.
Have anyone solved this problem yet?
The problem is described in Post 1 and 3.