Where is the motherboard battery on a dell precision m70

SOURCE: how do I reset my lost bios password for Dell

Hi,
If you cannot access the machine after if has been powered up, it is still possible to get past the BIOS password. The BIOS password is stored in CMOS memory that is maintained while the PC is powered off by a small battery, which is attached to the motherboard. If you remove this battery, all CMOS information (including the BIOS password) will be lost. You will need to re-enter the correct CMOS setup information to use the machine. The machines owner or user will most likely be alarmed when it is discovered that the BIOS password has been deleted.
On some motherboards, the battery is soldered to the motherboard, making it difficult to remove. If this is the case, you have another alternative. Somewhere on the motherboard you should find a jumper that will clear the BIOS password. If you have the motherboard documentation, you will know where that jumper is. If not, the jumper may be labeled on the motherboard. If you are not fortunate enough for either of these to be the case, you may be able to guess which jumper is the correct jumper. This jumper is usually standing alone near the battery. If you cannot locate this jumper, you might short both of the points where the battery connects to the motherboard.
If all else fails, you may have to clear the BIOS password by resetting the RTC (Real Time Clock) IC (Integrated Circuit) on your motherboard.
The BIOS password may be cleared from a Dell Optiplex by removing the password jumper (PSWD) from the motherboard.
The location of the password jumper on a Dell Optiplex motherboard can be found by reviewing the Optiplex User Guides.
For most Dell Optiplex desktops, the steps to reset a BIOS password and clear all CMOS settings are:

• Locate the 3-pin CMOS password reset jumper on the system board.
• Remove the jumper plug from pins 1 and 2.
• Place the jumper plug on pins 2 and 3 and wait approximately 5 seconds.
• Replace the jumper plug on pins 1 and 2.

SOURCE: resetear bios

Si se ha olvidado la contraseña del BIOS, you' necesidad del ll de entrar en contacto con el soporte técnico en Dell para resolver la contraseña

SOURCE: dim screen dell precision m70 too dark screen

try this press and hold Fn then tap on arrow up key check if the display will become bright. if fails try connecting an external monitor to your laptop check if display is fine. if not then uninstall video driver then install a latest one. if fails replace the video card drive or motherboard if video is built-in. if display is fine from the external monitor then reseat the LCD cable if fails then replace the LCD panel with the LCD cable.

SOURCE: how to break bios password for dell precision m70

The password exists to prevent a THIEF, in possession of your laptop, from "breaking-in" to the stolen laptop.

As such, find the original bill-of-sale, to prove your ownership, and contact Dell's Technical Support, and get them to assist you.

SOURCE: how do I reset my

open ram cover u will see the small jumer gold color just short it with flat screw driver .. thanks