Dell OptiPlex 990 Mini Tower Service Manual

Dell OptiPlex 990 Mini Tower Desktop manual cover
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Dell OptiPlex 990 Mini Tower Desktop Specification

The Dell OptiPlex 990 Mini Tower Desktop is designed to deliver robust performance and versatile expandability, catering to business environments that demand reliability and efficiency. Powered by Intel's 2nd generation Core processors, it offers options ranging from the Intel Core i3 to the more powerful Core i7, providing a scalable solution to meet various performance needs. It supports up to 16GB of DDR3 RAM, ensuring smooth multitasking capabilities and efficient handling of demanding applications. The desktop includes integrated Intel HD Graphics 2000 or 3000, with an option for discrete graphics cards to enhance visual performance for more graphics-intensive tasks.

Storage options include SATA hard drives with capacities reaching up to 1TB, offering ample space for data storage while maintaining rapid data access speeds. The OptiPlex 990 is equipped with multiple USB 2.0 ports, audio inputs, and outputs, plus options for serial and parallel ports, making it adaptable to a range of peripheral devices. Networking capabilities are robust, with integrated Intel 82579LM Ethernet LAN 10/100/1000 ensuring fast and reliable connectivity.

The chassis is designed for tool-less entry, facilitating easy upgrades and maintenance, which is ideal for IT departments looking to scale resources or replace components quickly. The device also emphasizes energy efficiency with its ENERGY STAR compliance and optional Dell Energy Smart settings, which help reduce power consumption. Security features include a Trusted Platform Module (TPM) and optional chassis intrusion detection, ensuring data integrity and physical security. Overall, the Dell OptiPlex 990 Mini Tower Desktop is a versatile and reliable choice for businesses seeking a balance between performance, expandability, and security.

Dell OptiPlex 990 Mini Tower Desktop F.A.Q.

How can I upgrade the RAM in my Dell OptiPlex 990 Mini Tower?

To upgrade the RAM, first power off your system and disconnect all cables. Open the side panel by unscrewing the screws at the back. Locate the RAM slots on the motherboard and insert the new RAM sticks, ensuring they are securely clipped in place. Reattach the side panel and reconnect all cables before powering on the system.

What should I do if my OptiPlex 990 won't power on?

Check if the power cable is properly connected to both the desktop and the power outlet. Ensure that the power supply switch, located at the back, is turned on. If the issue persists, try using a different power cable or outlet. If none of these steps work, the power supply unit may need to be replaced.

How do I reset the BIOS password on my Dell OptiPlex 990?

To reset the BIOS password, open the case and locate the CMOS battery on the motherboard. Remove the battery for a few minutes and then reinsert it. This will reset the BIOS settings, including the password. Power on the system and access the BIOS to set a new password if desired.

How can I troubleshoot overheating issues on my OptiPlex 990?

Ensure that the airflow is not obstructed by dust or debris. Clean the fans and vents using compressed air. Make sure that the desktop is placed in a well-ventilated area. If overheating persists, consider applying new thermal paste to the CPU or replacing faulty fans.

What are the steps to install a new hard drive in the OptiPlex 990?

Power off the system and unplug all cables. Open the side panel and locate the hard drive bay. Insert the new hard drive into an available slot and secure it with screws. Connect the SATA and power cables to the new drive. Close the side panel, reconnect the cables, and power on the system to format the new drive.

How can I improve the graphics performance of my OptiPlex 990?

Consider installing a dedicated graphics card compatible with the OptiPlex 990's power supply and motherboard. Ensure the card fits within the chassis. After installation, update the graphics drivers from the manufacturer's website for optimal performance.

Why is my OptiPlex 990 making a loud noise?

Loud noises are often caused by dust buildup in the fans. Clean the interior of your desktop using compressed air, focusing on the fans and heatsinks. If the noise persists, check if any components are loose or if the fans need replacement due to wear and tear.

How do I update the BIOS on my Dell OptiPlex 990?

Visit the Dell Support website and download the latest BIOS update for the OptiPlex 990. Follow the instructions provided with the update, typically involving running an executable file that automatically updates the BIOS. Do not power off the system during the update process.

What can I do if the USB ports on my OptiPlex 990 are not working?

Check if the USB ports are physically damaged. If not, update the USB drivers via the Device Manager in Windows. If the issue continues, try resetting the BIOS to default settings or check the motherboard connections to the USB ports.

How do I clean the inside of my OptiPlex 990 Mini Tower?

Turn off the computer and unplug all cables. Open the side panel and use compressed air to gently remove dust from the components and fans. Avoid touching the components directly with your hands. Reattach the side panel once the cleaning is complete.