Whining noise in the power steering system can be caused by several reasons:

1. Low power steering fluid: Check the power steering fluid level in the reservoir. If it's low, fill it to the correct level with the manufacturer-recommended fluid.

2. Contaminated power steering fluid: Over time, the power steering fluid can become contaminated with dirt and debris, causing the system to make noise. Flushing the system and replacing the fluid can help resolve this issue.

3. Worn-out power steering pump: The power steering pump may be worn out or failing, causing it to make noise. This usually results in a whining sound when turning the steering wheel.

4. Air in the power steering system: Air bubbles can get trapped in the power steering system, causing noise and affecting the performance of the system. Bleeding the power steering system can help remove air and resolve the issue.

5. Damaged power steering hoses or connections: Check the power steering hoses and connections for any leaks or damage. If there are any issues, they need to be repaired or replaced.

If you hear a whining noise coming from your power steering system, it's important to address the issue promptly to prevent further damage to the system.