First, let me say that I agree completely with Albert's assessment and think that you should take immediate steps to backup your information. There's no telling what state your hard drive is in right now - and any messing with it may just make it worse. That's why the need to back it up is so pressing (I'm the "voice of experience here", having lost 3 years worth of stuff due to a hard drive crash without a backup!)
If there is a problem with your hard drive, writing any data to it at this point could actually destroy some of the data that's on the drive.
Next, I must say that without knowing the basics of this problem, it's very hard to say that enabling "Large" will fix the problem. Right now, all we know is that your system won't load the operating system. But we don't know what's causing it. Have you tried to boot from a DOS diskette to see if you can see the hard drive? What else can you tell us about your system and this problem in particular.
If you're determined to go through with this, probably the best thing to do is to reset your BIOS to default, and then try to boot it up.
Here's the instructions from DELL on how to enter your BIOS( http://support.dell.com/support/topics/glo...2573#dimension2
Dimension 4200, 8100, and 8200 Systems
To enter the BIOS, CMOS, Setup, or the System Setup for the Dimension 4200, 8100, and 8200 systems, perform the following steps:
1. Restart your system.
2. At the first text on the screen, or when the Dell logo appears, press the <F2> key every three seconds until the message Entering Setup appears.
Once in the BIOS, on the bottom of the screen, there should be an option for SAFE or DEFAULT values. Select it and save the settings when you exit.
Another way to do this is to short out the CMOS jumper on the motherboard (you'll have to read your manual to locate this), or to remove the battery from the motherboard for about 30 minutes.
If this doesn't work, then you can try going back in and setting the hard drive from Auto to Large. If it causes problems - just use one of the above procedures to reset it to default values again.
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
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