MacBook Pro can't recognize battery, fan is at high speed and computer functions really slow

My MacBook Pro suddenly won't recognize it's battery so I tried rmoving it's battery and put it back again. I can use it but there is still an (X) sign instead of the battery percentage on the upper right corner of my desktop. After this I turned on my laptop and all of a sudden the fan turned on on high speed and it became slow (by slow I mean really slow) even if I don't open/use anything on my computer because of this I went to an Apple Service Center and they tried to check if its because of the hard drive, RAM and all that stuff. They told me it's not because of those things but they also told me that maybe the wiring or the cable of the battery that connects to the computer is not working so I have to replace it. But for the fan and the slowing of my computer they don't know what's happening.
I really need help. Pleaseeeeeee. Thanks in advance.
MacBook Pro 13"
OS X - 10.9.5
Processor 2.4 GHz Intel Corr 2 Duo
Memory 4 GB 1067 MHz DDR3

Perform a SMC reset:
http://support.apple.com/en-us/HT201295
If no change, run an Apple hardware Test:
http://support.apple.com/en-us/HT201257
Ciao.

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Hi Richard-G,
I'm sorry for the delay in my reply, as I have been out of the office since last Thur. The instructions would have been the same for your notebook, but not the same BIOS.
This document will guide you through updating your BIOS if you wish. Since the noise is reduced once Windows begins, I would not worry too much about this.
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Charge Information:
Charge Remaining (mAh):          0
Fully Charged:          No
Charging:          No
Full Charge Capacity (mAh):          0
Health Information:
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Battery Installed:          No
Amperage (mA):          0
Voltage (mV):          0
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Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          10
Sleep on Power Button:          Yes
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
Wake on LAN:          Yes
Current Power Source:          Yes
Display Sleep Uses Dim:          Yes
GPUSwitch:          2
PrioritizeNetworkReachabilityOverSleep:          0
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System Sleep Timer (Minutes):          10
Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          2
Sleep on Power Button:          Yes
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
Display Sleep Uses Dim:          Yes
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Reduce Brightness:          Yes
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UPS Installed:          No
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MacBook Pro can't recognize battery, fan is at high speed and computer functions really slow

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