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it could be a problem with hard drive, try replacing it with a spare hd , if its still the same then maybe you could take out internal battery and put it back in ,even take out mem and put back in at same time of taking out internal battery ,it could help resolving the problems.
Search for a recent update for your bios. You can also try a different bios all together. Google "Acer AOD257 BIOS Upgrade" and "Acer AOD257 compatible BIOS". I remember my old BIOS having very limited options available. The BIOS I use now has two pages of options. Hope I was able to help!
If there is a password protected BIOS that you need to unlock or reset as the case may be, disconnecting the BIOS battery will reset it. This will require you to open the case and pop the battery out and back in. If you can provide specific models, I'm sure we can locate a guide or post steps to accomplish this. Alternatively, this guide covers several potential methods to accomplish this via software:
on the underside you can take off a panel with a screw driver by unscrewing the philips head screw, and from there, you should find a small, flat, round looking battery, it may be in a yellow or black coating. you have to disconnect this, and then reconnect it. this will reset your bios.