Thanks for your reply. I am running an Arduino/"genuino" uno with the USB cable attached to the computer. I have used it on 3 other programs and it worked perfectly. The USB port works. I tested the 5 V pin and it delivers a steady 5.8 V, when I hit reset the "TX" green light comes on momentarily. The red led labeled "ON" is on the the green LED labeled "L" both are on continuously. You are right about other programs won't run either - I just loaded "Blink" and it gave the same error code. So there are now no connections to any pins. I'll repeat only the last 3 or four lines. By the way the sketch shown in the error code "LMT01_Arduino_Example_Code_1.0" I was having lots of trouble with. I'm not sure why it is showing as the problem here.:
An error occurred while uploading the sketch
Invalid library found in C:\Users\Don \Documents\Arduino\libraries\LMT01_Arduino_Example_Code_1.0: C:\Users\Don \Documents\Arduino\libraries\LMT01_Arduino_Example_Code_1.0
Invalid library found in C:\Users\Don \Documents\Arduino\libraries\LMT01_Arduino_Example_Code_1.0: C:\Users\Don \Documents\Arduino\libraries\LMT01_Arduino_Example_Code_1.0
I went into the Documents/Arduino/L\libraries and I found the trouble maker "LMT01_Arduino_Example_Code_1.0" and deleted it within Windows Explorer. This time I got the much shorter error message:
Arduino: 1.8.5 (Windows 10), Board: "Arduino/Genuino Uno"
C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Don \AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Don \AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\Don \Documents\Arduino\libraries -fqbn=arduino:avr:uno -ide-version=10805 -build-path C:\Users\Don \AppData\Local\Temp\arduino_build_195675 -warnings=none -build-cache C:\Users\Don \AppData\Local\Temp\arduino_cache_373320 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Program Files (x86)\Arduino\examples\01.Basics\Blink\Blink.ino
C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Don \AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Don \AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\Don \Documents\Arduino\libraries -fqbn=arduino:avr:uno -ide-version=10805 -build-path C:\Users\Don \AppData\Local\Temp\arduino_build_195675 -warnings=none -build-cache C:\Users\Don \AppData\Local\Temp\arduino_cache_373320 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Program Files (x86)\Arduino\examples\01.Basics\Blink\Blink.ino
Using board 'uno' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr
Using core 'arduino' from platform in folder: C:\Program Files (x86)\Arduino\hardware\arduino\avr
Detecting libraries used...
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino" "-IC:\Program Files (x86)\Arduino\hardware\arduino\avr\variants\standard" "C:\Users\Don \AppData\Local\Temp\arduino_build_195675\sketch\Blink.ino.cpp" -o "nul"
Generating function prototypes...
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino" "-IC:\Program Files (x86)\Arduino\hardware\arduino\avr\variants\standard" "C:\Users\Don \Data\Local\Temp\arduino_build_195675\sketch\Blink.ino.cpp" -o "C:\Users\Don \AppData\Local\Temp\arduino_build_195675\preproc\ctags_target_for_gcc_minus_e.cpp"
"C:\Program Files (x86)\Arduino\tools-builder\ctags\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\Users\Don \AppData\Local\Temp\arduino_build_195675\preproc\ctags_target_for_gcc_minus_e.cpp"
Compiling sketch...
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -flto -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino" "-IC:\Program Files (x86)\Arduino\hardware\arduino\avr\variants\standard" "C:\Users\Don \AppData\Local\Temp\arduino_build_195675\sketch\Blink.ino.cpp" -o "C:\Users\Don \AppData\Local\Temp\arduino_build_195675\sketch\Blink.ino.cpp.o"
Compiling libraries...
Compiling core...
Using precompiled core
Linking everything together...
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-gcc" -w -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=atmega328p -o "C:\Users\Don \AppData\Local\Temp\arduino_build_195675/Blink.ino.elf" "C:\Users\Don \AppData\Local\Temp\arduino_build_195675\sketch\Blink.ino.cpp.o" "C:\Users\Don \AppData\Local\Temp\arduino_build_195675/..\arduino_cache_373320\core\core_arduino_avr_uno_0c812875ac70eb4a9b385d8fb077f54c.a" "-LC:\Users\Don \AppData\Local\Temp\arduino_build_195675" -lm
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-objcopy" -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 "C:\Users\Don \AppData\Local\Temp\arduino_build_195675/Blink.ino.elf" "C:\Users\Don \AppData\Local\Temp\arduino_build_195675/Blink.ino.eep"
"C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avr-objcopy" -O ihex -R .eeprom "C:\Users\Don \AppData\Local\Temp\arduino_build_195675/Blink.ino.elf" "C:\Users\Don \AppData\Local\Temp\arduino_build_195675/Blink.ino.hex"
Sketch uses 928 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM3 -b115200 -D -Uflash:w:C:\Users\Don \AppData\Local\Temp\arduino_build_195675/Blink.ino.hex:i
avrdude: Version 6.3, compiled on Jan 17 2017 at 12:00:53
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"
Using Port : COM3
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x30
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x20
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x30
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x20
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x30
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x20
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x30
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x20
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x30
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x20
avrdude done. Thank you.
An error occurred while uploading the sketch
I think all my troubles started with "LMT01_Arduino_Example_Code_1.0". I may have somehow contaminated the IDE with an improper install of that program. Should I delete the IDE and start over reinstalling it.