Case 1840 shuts down while using then starts up???? What would cause this issue?

No free ones, but a link to the Service Manual. There are free schematics to wiring.

https://www.google.com/search?q=Case+1840+Uni-loader+Fuse+box+diagram

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There could be a few potential causes for this issue with your Ryobi battery-operated trimmer:

1. Battery issue: If the battery is low on charge or not able to provide enough power to the trimmer, it may shut down when operating at full throttle. Try charging the battery fully and see if the issue persists. If the battery is old or damaged, it may need to be replaced.
2. Overheating: If the trimmer motor or battery overheats, it may shut down to prevent damage. Try using the trimmer for shorter periods of time and allowing it to cool down between uses.
3. Trimmer head or cutting line issue: If the trimmer head or cutting line is damaged or worn, it may cause the motor to work harder than normal, leading to overheating and shutdown. Check the trimmer head and cutting line for damage and replace as necessary.
4. Trigger or motor issue: If the trigger or motor is faulty, it may cause the trimmer to shut down when operating at full throttle. Contact Ryobi customer support or a professional repair technician for assistance in diagnosing and repairing the issue.

Overall, it's best to start with the simplest potential causes first (such as the battery charge level or trimmer head condition) before moving on to more complex issues like faulty triggers or motors.

I heard of many power issues with these models. Mostly concearning the battery, it sounds like this may well be the case from the 'light flashing' issue.

The other problem involving slow start up/ being laggy could be down to the machine running hot and Windows is using passive cooling in the power options, or a failing hard drive can also cause software problems.

Hello and thanks for using Fixya ...
This issue you described it can have several different causes...
first it can be a virus causing something and as a prevention the computer is turning itself down to avoid damages...and in this case you should be able to fix it by reinstalling the operation system from scratch ..using a bootable disk with the OS on ..and formatting the hard drive C partition during the installation to get rid of eventual bugs..
Ifr after this operation the computer is still doing the same ..it indicates that the cause it is of a physical damage or compatibility issue..
Chech the ram memory not to be damaged...and do this by uing the computer with only one module at the time ..and let it work untill it does the same or not...Keep the modules that do not cause the shut down ..and replace the others..
If the shuting down is actually a restart ..and it does it after showing the blue screen error ..than the cause is almost for sure the Ram memory units...and even if they are not damaged...the cause can be just a compatibility issue ..Check on the web for the specs of the motherboard...and see what they say about the Ram memory speed amd maximum value ..For example ..if your computer was build to use Ram memory up to 533 mhz or 667 ...and you use same DDr2 modules but the speed is up to 800 Mhz ..it is possibleto work a while and after that to start making problems on start up ..and shuting down suddenly with no warning ..and work fine if you restart it ..but ...making the same sympthoms after a while ..(usually the interval is smaller after it is warming up ..)
In this case you need to buy replacement and whith the exact specs like the ones in the manual..
Also do not use the maximum value supported..but for example if you have 2 slots suporting 1 G each ...use one with 1G and one with 512 M and it will work for sure..
another cause can be a CPU related ...if in BIOS settings it was by mistake or as a protection ..set a maximum allowed teperature...This will cause automatic shut down when the cpu gets to that temperature...The best way to avoid this ..is to get into BIOS ..and engage the optimal factory settings from the function key indicated by your Bios edition ..and after that use the F10 key to save the settings and exit..This will prevent the shut down if it is related with a strange setting made in bios..
If after all these the issue is still present ..the only thing that can be damaged is the motherboard...and it is probably something sensitive on temperature..and it works fine untill getting to the critical value..
This wil aply also to the power source ...If the fan is not working or it is dirty and do not do the job ...the power source can actually shut itself down as a protection when it gets to a certain temp.value..
have a nice day ...and I hope this will help ..

You will have to figure out what the lockup is as well. That could be a program or windows or even a overheating issue as the cause. Or it can be one of those things that it just does to irritate the heck out of you and you never can figure it out ;-]

The first step is you need to shut it down. You can push and hold the power button down. If it is just a software thing this usually is enough to shut it down. The next thing to do is to take out the battery. The battery will cause windows to complain a little that it wasn't shut down properly and will want to check things on reboot. Let it do that. Once you can shut it down then you can start trying to watch for symptoms when you reboot. You can check for warm spots on the chassis or maybe a program you were running or started or in quite a few cases nothing at all.

What year is your case? It will be either the Ignition cylinder or wiring short if an older model.Could also be your starter solenoid.

Friends can find the Case 1840 Service Manual you want here: https://www.manualbuy.com/product/case-1840-skid-steer-loader-service-manual

i have the same problem...laptop randomly shuts down, but its even done it within a minute of turning it on so i don't think its a heat issue. Sometimes it'll run for over an hour with no problem and never shut down, but other times it randomly shuts down sometimes within a minute, sometimes maybe 10 mins, sometimes 30 mins or more ...its maddening! i'd love to find a solution if anyone's found one. Thanks.

A Vista Upgrade from XP could cause problems, and even the one you describe, but not an "update" usually. But then again, if when it shuts itself down, if you have to press the power button twice to get it to start back up, I would say that the processor is overheating (in which case the system does this to keep from frying the CPU). If that's the case, a cleaning of the fan and heat sync could fix the problem. You could also run temperature monitoring software (plenty are available for free trials).
As always more detailed information on this issue you are having would help.
Good luck.