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If you are getting noting at all on the screen. There are several possibilities for this the most obvious being that you installed the Wrong BIOS and it's no longer working or the EPROM Writing Hardware Involved wasn't working correctly.

HP is most likely to provide a replacement M'Board and charge you for it as this is the normal fix for a faulty BIOS Chip but you can buy a BIOS Chip from a different supplier fit it yourself and be up and running quite quickly and for a much cheaper price.

This place supplies BIOS Chips and offers a great service. Personally I always use them whenever I'm upgrading the BIOS in any Mission Critical Servers and I've yet to have a problem with any of their products.

http://tinyurl.com/sgv6v

You should be looking at one of the PLCC Chips but you'll have to get all the requested information before ordering the chip or you are likely to end up with the wrong one and have happen again what is happening now.

Col

Hello,

I have finally found a link where is find a solution for my computer, it is working with the series ze4200 :

http://forums1.itrc.hp.com/service/forums/bizsupport/questionanswer.do?threadId=974719

Thanks for your quick reply.

Regards,

Jan

Hi Jan:

I am a computer technician. I have a business in Massachusetts. One of my customer is having this same issue. Her boyfriend setup a BIOS password, and he just can't remember that now. Since it is a laptop, there is no built-in jumper to reset that password. The only ones who can really fix that problem is HP. I already contacted them last night, and they would charge US$298.00. Well, no way. I know my customer can get that same unit by adding up a couple hundred dollars. It doesn't worth paying them that money for something that will take them less them 5 minutos. Oh, yes, that I know. But, meanwhile, this is what I am trying to do: disconnect the power supply, remove the battery, and also unplug the CMOS battery (that one that looks like a watch battery) for at least 48 hours. Then after that, put the CMOS battery back in, and the battery and power it up and cross your fingers. It usually works on desktops that don't have a built-in reset jumper.
Good luck!

Elcenir Carvalho