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Hi experts, I recently purchased an e-system laptop (intel celeron m430 1.73GHz), the motherboard reads 'Hannstar J MV-4'. After switching it on one day I found a BIOS password had been set. I've tried the following steps to bypass this and still the password dialog appears: - tried all phoenix bios backdoor passwords - removed the CMOS battery (for several days) and tried to boot it without it - removed battery and CMOS battery and depressed the power button for 30 seconds (somebody told me this would flush data from capacitors) Can anybody suggest anything? This is a guess to a degree because I don't know about the brand of motherboard your laptop uses, however, nearly all motherboards have the same feature. In order to clear the BIOS you must not only take out the battery, but also place a jumper in the 'clear CMOS' position to wipe out everything. This will usually wipe out the password as well. Engineering And Managerial Economics Book By T.n. Chhabra Pdf. As R Broyles said, you may need to contact the manufacturer to find out where this jumper, or sometimes just two points on the motherboard, is in order to short the leads.

I don't know if this will be too helpful or not, but I researched the Hannstar motherboard and discovered a few things which may clarify your solution, if any. And I say 'if any' because there may not be a way to change the password. If it is a BIOS motherboard password, it may be nearly impossible to get help unless your computer is a major brand.

Even then, if it is a Toshiba, you can pretty much forget support from them. Hannstar's web site in Taiwan is and they have an email form for contacting support. However, I discovered Hannstar is not actually a motherboard manufacturer at all. They are a re-brander. Further research showed that the Hannstar J MV 4 motherboard was actually produced by Clevo, a well-known and well-respected notebook motherboard manufacturer.

The Hannstar J MV 4 is actually a Clevo D500 motherboard. This mobo was produced for a number of companies, including Toshiba, Dell and a company that may be able to help, Sager Notebooks. Sager (web site: ) may be able to help only because I've noticed they sometimes have some older repair parts hanging around. I have resold a number of their machines and they will have a tech that can talk to you.

They are a smaller company building notebooks and many of their machines have been re-branded by Dell (also a possible supplier of a replacement motherboard, or support??). Clevo can be found at and they may respond to you. However, I've sold a number of notebooks based on Clevo boards and when I went to their site this time, every piece of archival information has been purged from their site. In the past they had a way to order parts, find manuals, drivers, etc. Now, there is nothing but marketing for their current models. I noticed in a forum a similar complaint from another system builder about them changing their website.They have also closed their ftp site. If, as gfdos notes, the password is for your hard drive, you can just replace it with one from Newegg.com or some other source.

If it is the motherboard, it seems no one has a schematic or even a simple motherboard manual. At least, I haven't yet found one.