With it being a dell, there should be a jumper on the motherboard. Unplug the computer, change the jumper to whatever its secondary position is, plug it in, hit the power button once to turn it on, then again to turn it off. Unplug it and put the jumper back in the original position. this should reset the bios and clear any password. If this does not work, remove the jumper completely, and repeat. Dell's have really wonky bioses.
I actually removed the jumper and put plugged into a secondary position and again it came up to enter current password.
When I turn on the pc, the dell splash screen comes up and then the next screen says:
Dell Dimension 4500
Intel pentium 4 processor 1.80 ghz
250mb system ram
Legacy keyboard - detected
Legacy mouse - detected
USB legacy - enabled
primary master hard disk error
Press <DEL> to run setup.
And when I hit <DEL> it brings me to a screen that's blank, but in the middle of the screen it says "enter current password". When I try to "guess" the password, it puts a big X and then on the next line it say "enter current password". Again I try to guess the password and it puts a big X and then on the next line "enter current password" and try to "guess" the password and it puts an X. It gives me only 3 tries and at the bottom of the screen it says "fatal error", press <DEL> to run setup. When I press <DEL> nothing happens.
Ok - when I had my OLD CMOS battery, when I turn on the pc, the dell splash screen comes up and then the next screen says:
Dell Dimension 4500
Intel pentium 4 processor 1.80 ghz
250mb system ram
Legacy keyboard - detected
Legacy mouse - detected
USB legacy - enabled
primary master hard disk error
Press <DEL> to run setup.
And when I pressed <DEL> to run setup, it actually took me into the bios screen. And when I clicked save and exit, the pc would reboot and it would go into the dell splash screen and the next screen would say
Dell Dimension 4500
Intel pentium 4 processor 1.80 ghz
250mb system ram
Legacy keyboard - detected
Legacy mouse - detected
USB legacy - enabled
primary master hard disk error
Press <DEL> to run setup.
I hope this is more clearer on what is happening. Man, this took a long time to explain it.