Power steering noise constantly

[geoweb2k14]

Hi guys, so here goes! 

I changed lower ball joints to day- no big deal there. The problem is that I noticed a drip of oil on the ground and opened the bonnet. I then noticed that the power steering reservoir was completely full with excess fluid after dripping out. Question 1,,,,,How could this have happened as I didn't top up the fluid levels? 

To add more info my Battery had died while doing the joints as my lights were left on. I got a jump start and all was good but when I went to drive out of my yard I had a whinging noise while turning the steering wheel. This was not there before I started the job. The fluid level is puzzling me????

Any ideas what the issue here is?????? 

[alan333]

Perhaps an airlock somehow?  Turn the steering full lock one way to full lock the opposite way a few times with the engine off and see if anything changes.

[geoweb2k14]

Thanks Alan, car now appears fine after I done like you said and charged the Battery. The steering wheel is now not straight. I'm baffled??