Apple laptops run at half CPU speed when there is no battery installed, so this is at least part of why your computer is so slow. It does sound like the computer has had some sort of severe damage.
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Need Urgent Macbook Pro help please! (many issues)
- Thread starter Dare_O
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You (chrfr, snaky69) were both beat to it as I mentioned the lack of the battery as a probable cause in post #12. The problem with the trackpad sensor (likely in the cable), which people with the same issue say causes the fan to run constantly, could also be a cause of the performance issue. The jury's still out on this one but it seems like the connectors (trackpad, keyboard, possibly one of the USB ports) rather than a major logic board issue is the problem. The AHT and whatever diagnostics the "tech guy" ran did not result in any problems other than the sensor, the liquid spill indicators (at least the one near the trackpad connector) hasn't been tripped and a visual inspection of the logic board hasn't turned up any obvious issues.