I am thinking that you may have a virus or malware that has infected your system to be getting this type of problem. Go to the following sites and download and runs these apps. in an attempt to find and clean the system.
Ruun this next program and perform a quick scan, show the results when scan is complete and delete everything it finds.
http://www.filehippo.com/download_malwarebytes_anti_malware/
This next app is a free anti-virus that just needs you to register it once a year...that's it. install this program and when it asks to perfrom a bootup scan, answer yes, that way this program will scan your hard drive before windows actually loads, that way all files will be scanned.
http://www.filehippo.com/download_avast_antivirus/
If you are getting a no hdd detected even after you reformat, this may be an issue with the hard drive itself, usually when a booting failure occurs from a abad hard drive, the system tries another boot device such as network drives. The computer will throw a code such as PXE no media detected. Hard drive failure willcause these issues.
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Sorry, I think the proposed solution will not work. I'm sure the problem is not from OS(Windows) it is from hardware or maybe software in BIOS. It is because, i already reformat the SYSTEM still the problem exist, as i checked the BIOS no HDD detected that's why when i start my laptop it message no boot device, but when i reset the BIOS by load setup defaults then it works can access to windows. Anybody have an idea on how to fixed it?
reply from comment dated oct. 10,2009. maybe you have a point, but i strongly believed that the problem is from mainboard or bios, because when i reset the bios by setting up to load setup defaults the system works normally it can access to windows, even when i restart the system it works ,but when i shutdown the unit and power up again it arrives to no boot device detected, you need to setup bios again by loading setup defaults so that it works. and i think no problem with the hard disk because when i open some files located in all partition, no problem its fine and no crashing i encountered which is a symptoms of some bad sectors in hard disk.
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