Os not found - Acer Extensa 5420-5687 Notebook

1. Damaged hard drive is a very common cause for that problem. Once your OS is not 'readable' some parts of the drive might be damaged and is best to change hard drive and reinstall OS and applications.

2. A very corrupted OS (you deleted critical parts of the OS or have a virus) might fail to load and then you could perform a restoration if you have the OS on a drive or a reinstallation.

I have not been able to find any full retail versions from apple. I have found them on ebay and amazon. They are expensive and I do not have any more good disks with it. I found that the best os for g4 ppc macs is 10.4.11 but 10.5 will work on G4 867 and faster. I did not get much happiness from 10.5 on any G4.


So the rule of thumb I use is, 10.4 on G4 and 10.5 on G5 and up

if its saying that, the os might be corrupt, or the hard drive is bad. if you have the necessary os disks, you can try to re-install the os, but if those dont work, you might need a new hdd

Download the OS from the Alesis website, write it to a CD as an ISO image, put the CD in the Alesis, and follow prompt to load the OS

The mac operational system is designed for apple computers only, It will only recognize the drivers in the apple product line. The pc computers have a different configuration and will not except this software.

I found that downloading and writing of the OS to a CD was operating-system dependant - I spent ages trying to get an OS downloaded through WIndows Vista to work, with no luck, but when I found a previous OS disc that I'd created with XP, that worked fine.

Vista OS is corrupt...you may need to re-install the OS....
some or many of the required files to load the OS is corrupt or missing...

the solution: Re-install Vista OS or Win7 or XP....
if your have your HD partitiond and have only OS and re-instalable programs in C: / and keep your critical data in say D: or E:..drive.....then you just need to format only C: and install the OS again....

Hi edn, I have found a site that maybe helpful for you. You can visit this site:

http://driverscollection.com/?H=X1270&By=Lexmark&SS=Windows%20XP

Before downloading, please press the link that is matched with your OS(Operating System). The following link that I have provided for you is for Windows Xp OS. If your OS is different please click on the OS link that is matched for you then click on the link that says "Download Lexmark X1270 Driver"

Hope this help. Thank you and God bless

You will need to format and reinstall the operating system.

insert the windows/restore cd, turn on the power, press a key when it directs you to and run through the setup process.

Windows Vista Drivers http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=2093&lc=en&dlc=en&cc=us&lang=en&product=3801545

Windows Vista 64bit
http://h10025.www1.hp.com/ewfrf/wc/softwareList?os=2100&lc=en&dlc=en&cc=us&lang=en&product=3801545