Mac Mini light comes on, but no chime.

Mac Mini light comes on, but no chime. I purchased a 1.66 Core Duo mini early last year, ran sata out the side, and upgraded to a T7200 processor. Over the past month, I got a couple of lockups under load (importing CDs), and once a GSOD.
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bert [Entry]

"markus weiher

@markusweiher

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bert [Entry]

Check the voltage coming out of the power supply first. Maybe you got off easy.

bert [Entry]

I had a late 2007 Mac mini and took it in to have it looked at by an Apple staffer at a storefront (same situation as described in this post). He didn't do nearly as much as I had done, and seemed tethered to what he could do on the keyboard, which did nothing. He tried a separate power brick and the behavior was the same as described in this post. It was hot in the room the day it failed (screen went off in the middle of usage). His guess, which was no better than mine, was that the logic board failed. He offered to do more, but I asked him how much the repair would be and he agreed that any way I looked at it, probably $100's to fix. I parted and three cheery, un-caring sales clerks wished me a good day as I left, looking very sober and disappointed. I'm currently using a $6 SATA enclosure and pulling my data off and onto an NTFS storage drive using some HFS+ capable software from a SourceForge project.

bert [Entry]

Hello , No Booting Sound and single flash of the power LED then a loud fan sound due to high rotation speed !! . check nothing. Had this problem before and i did fix it by replacing the main board battery. that easy and that simple. Check youtube for how to disassemble.