There seems to be a lot going on here. First I should say, you should never touch a motherboard or any motherboard components when the power is applied to it, as in checking the temperature of the components.
Even a slight touch could cause a static discharge that could result in a motherboard failure.
Usually, when a system will not even show the BIOS screen, I would suspect a failed motherboard.
However, there are some components that can cause this as well.
Here is a link for your system specifications. The beep codes are listed here in the Service and maintenance information.
If you removed or disconnected all the components and the system tried to boot, and gave you some beep codes, it may not be a failed motherboard, but a defective component connected to the motherboard.
First, a VERY IMPORTANT CAUTION. Never boot a compter without the CPU heatsink and thermal paste installed.
This could cause the CPU to burn itself out in just a few seconds.
I would make sure the CPU, with heatsink and thermal paste, is installed. Have no other devices connected, including memory. Boot the system and see if you get any beep codes. If so, add one memory module and reboot the system, and see if you get any beep codes. If so, replace the installed memory module with the other memory module and reboot. See if you get any beep codes. Install the video card if you have one other than an onboard video device.
Since you removed the CMOS battery, the BIOS will be at the default setting. If you can get the system to enter the BIOS, set the time, date and default setting, save your settings and reboot. See how far you can go. If you are successful to this point, you will get an error the no hard drive is found. Now is the time to connect the hard drive and reboot, and see if you are successful.
Hope this helps.
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