Battery shows X and fans run constantly.

All of a sudden yesterday, my computer wouldn't turn on. I finally took the battery out numerous times and decided to hold the power button, that fixed it. Now, my computer works but the battery at the top corner shows an X (but works when unplugged) and my fans run constantly.
I know this issue was common on the old plastic MacBooks, but I can't find any issues with this one.
-Unibody 2.0Ghz w/ 4GB of Ram.
It's updated to 10.5.7

Usually when the battery display shows an X, it means there's no battery detected. Yet you say it works when unplugged. Odd.
The first step is always to try resetting the SMC, which it kind of sounds like you did:
http://support.apple.com/kb/HT1411
You can also try zapping the PRAM:
http://support.apple.com/kb/HT1379
The high-running fans might be the result of an out-of-control CPU process. Check Activity Monitor (make sure it shows "All Processes" and not just "My Processes") and see if something is eating up a bunch of CPU. You can kill that process from within Activity monitor and see if that helps the fan.
If none of those work, call AppleCare or visit your local Apple Store Genius, and have it serviced under warranty, as it's likely a hardware issue. Good luck!
Message was edited by: Jay Bullock

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Here is the EtreCheck results:
Problem description:
fans running constantly and CPU slowing down
EtreCheck version: 2.2 (132)
Report generated 4/28/15 7:42 AM
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The following internal tasks failed to complete:
/usr/sbin/system_profiler -xml SPFontsDataType
Hardware Information: ℹ️
    MacBook Pro (15-inch, Mid 2010) (Technical Specifications)
    MacBook Pro - model: MacBookPro6,2
    1 2.66 GHz Intel Core i7 CPU: 2-core
    8 GB RAM
        BANK 0/DIMM0
            4 GB DDR3 1067 MHz ok
        BANK 1/DIMM0
            4 GB DDR3 1067 MHz ok
    Bluetooth: Old - Handoff/Airdrop2 not supported
    Wireless: en1: 802.11 a/b/g/n
    Battery: Health = Normal - Cycle count = 141 - SN = W0020PTD7BWZA
Video Information: ℹ️
    Intel HD Graphics - VRAM: 288 MB
    NVIDIA GeForce GT 330M - VRAM: 512 MB
        Color LCD 1440 x 900
System Software: ℹ️
    OS X 10.8.5 (12F45) - Time since boot: 0:39:23
Disk Information: ℹ️
    TOSHIBA MK5065GSXF disk0 : (500.11 GB)
        disk0s1 (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 499.25 GB (73.74 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
    MATSHITADVD-R   UJ-898
USB Information: ℹ️
    Apple Internal Memory Card Reader
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM2070 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Computer, Inc. IR Receiver
Gatekeeper: ℹ️
    Anywhere
Kernel Extensions: ℹ️
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        /Applications/Roxio Toast 6 Titanium/Toast 6 Titanium.app
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    DigidesignLoader: Path: /Library/StartupItems/DigidesignLoader
    RDUSB0138Startup: Path: /Library/StartupItems/RDUSB0138Startup
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3rd Party Preference Panes: ℹ️
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            Backup size 3.00 TB > (Disk size 499.25 GB X 3)
    /sbin excluded from backup!
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Diagnostics Information: ℹ️
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