Compaq NC6400 bios problem?

[lezsimply]

With respect to speedypro I decided to create my own thread.

I programmed bios chip of this laptop compaq nc6400 a while ago. First boot no display, turned off and rebooted again luckily it displayed and indicated that something was changed and offers me to save changes. But I didn't attached any keyboard so I decided to press power button to turn it off. When I attach usb keyboard then turned on laptop and poof no display again.

I just wanted to know if bios is a goner. Prior to that this laptop is working 2 days ago. and then this morning it just won't display anymore even externally. That is why I decided to flash bios. I noticed that cmos battery is low so I replaced it same thing happens. I don't think video chip is involve because it was well ventilated heatsink is not clogged. What do you guys think? Thanks everyone

[999999999]

Re: Compaq NC6400 bios problem?

Unplug both the CMOS and main battery and leave disconnected for a few minutes. Plug CMOS then main battery back in and try again.

It is generally not a good idea to try to flash a bios to a system having problems, but at this point repeating the battery disconnect, reconnect, and power on cycling a few times seems like the best chance.

[Microbe]

Re: Compaq NC6400 bios problem?

okay man,

does it has discrete Nvidia chip?? if so try to reflow it at the beginning.
if still same then replace the bios chip with a new one.

[lezsimply]

Re: Compaq NC6400 bios problem?

@9

I usually fix laptop with no display using bios programming. I didn't thought that was bad. When this laptop came it has no power. I disassembled it and clean the board. I ran it outside the case and displayed successfully for 2 days. I knew the cmos battery is out but did not replaced it immediately. So now when I was booting it up to install fresh OS nothing appeared. It booted once after I flashed bios with file coming from hp website.

@microbe

I verified that video chip is Intel because I cannot see any ATI markings on all chips, And also I did see 945 markings on the chip beside processor socket. I'm looking for new bios chip here in my country but I cannot see one. I can only find on ebay and it is already programmed.

[lezsimply]

Re: Compaq NC6400 bios problem?

For the record I fixed this laptop by flashing bios. Attached bios file for future reference. Thanks!