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Pros: Showed signs of promise.
Cons: DVD-RW drive had issues.
Excessive play in lid hinges.
Second T420 had low-res display and power-on issues
Other Thoughts: I received a model 4236-A79, manufactured 08/11. The battery was in good condition but had 382 cycles - a bit on the high side. It was refurbished by planITROI. The DVD-RW drive has some issues loading disks It came with two 2GB SoDIMMs. It model number isn't in TABook and I only found one reference on the Lenovo website. It has a camera but no fingerprint reader. The tag in the battery compartment says "Lenovo Singapore". The bios was the original 1.31. The hard drive and DVD drive were both manufactured in 2011, so they were probably original to this laptop. Now for the good - it's in excellent condition with only minor signs of wear. The keyboard looks like it's new. Windows 7 Pro x64 activated without issues. Speedwise it's a big step up from my aging T60p.
UPDATE 2/18/2016 - POT LUCK...
I ended up returning the one reviewed above for excessive play in the hinges. It had the 1600x900 display and a generic AC adapter.
I exchanged it for another. This one came with the 1366x768 display, one 4GB SoDIMM, a Lenovo AC adapter, and a 2011 battery with only 43 cycles on it! It was model # 4236-DJ7.
The unit looked absolutely new. Unfortunately the power button was glitchy - it sometimes wouldn't turn on even with repeated presses. I returned it and ended up piecemealing a T420 together and got exactly what I wanted (HD+, webcam, fingerprint reader) for less money, but no warranty.
Pros: This is running a digital sound processing system 24/7, perfectly stable for the last month, CPU temp 46 degrees C with a continuous 20% CPU load. It's running Windows 7.
Cons: While a passive heat sink would be nice, once the CPU fan is switched to "Smart Fan" in the bios, I can't hear it.READ FULL REVIEW
Pros: Tips fit securely, inexpensive, works
Cons: #4 tip was missing from my package
Other Thoughts: When I opened the package, there were only 12 tips - the #4 tip for my antique Thinkpad was missing. I submitted an RMA request to Rosewill explaining the issue, and got a prompt response that the missing tip would be sent to me. I got it in 2 weeks and now everything's working great.READ FULL REVIEW