What happens when you connect the internal HD externally via a FireWire case, or use some other external drive that has a bootable OS the system will work with.
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What happens when you connect the internal HD externally via a FireWire case, or use some other external drive that has a bootable OS the system will work with.
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=== Update (02/20/2016) ===
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You may want to look at getting a SSHD hybrid drive to replace your old drive. It will offer some speed improvements and the Seagate drive is compatible with your system.
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You need to be careful as you have an older version of SATA: SATA I (1.5 Gb/s). Many of the current drives run at SATA III (6.0 Gb/s) which is just too fast for your system.
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Here's the drive I would recommend putting in: [http://www.seagate.com/internal-hard-drives/solid-state-hybrid/desktop-solid-state-hybrid-drive|Seagate Desktop SSHD]. I would go with the smaller unit (1 TB).
What happens when you connect the internal HD externally via a FireWire case, or use some other external drive that has a bootable OS the system will work with.