Follow up to "Boot fails at checkpoint Ithr" from a couple of weeks ago 2116
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Thanks to both Chris and yourself for the very good information. Briefly here is the current setup for both machines.
4700 (New) the subject of my previous posts --- USB connections: Logitech Wireless Keyboard and Mouse, D-Link USB Wireless, Dell FP1907 with USB ports.
On the refurbished unit, which is actually newer than my "new" 4700, the BIOS version is indeed A10. On my "new" 4700 the version number is A09. The case interiors are spotless...
4700 (Refurbished Unit) now showing the same symptoms as my new 4700 --- USB connections: Epson Stylus Photo R200, Epson Perfection 1650 Scanner, Samsung ML-1430 Laser Printer, Creative WebCam, Logitech Wireless Keyboard and Mouse, Kingston USB Key 128 MB.
Until last week this configuration was switched. I just reorganized my office and moved all the gear now on the refurbished unit from the new unit. I have tried leaving everything but the monitor and keyboard-mouse unplugged when this problem happens and it makes no difference. Neither machine will boot until I remove the battery on the motherboard for a few minutes and then try to start the system(s).
I do not believe that heating is the problem. So I will try to troubleshoot the system, but this error does not occur with any frequency. The computer will boot just fine for days and days and days, then out of the blue it will not boot up. None of my USB connected hardware has ever given me any problems.