my computer system went out in my lexus it will not come on without a jumpstart and its starting to run hot they tell me it needs a relay switch

The "computer system" is very vague. If your car doesn't start without a jump you need to have the battery tested and replaced if needed. Running hot could be caused by low coolant, bad engine fan, bad thermostat and many other things. We won't be able to diagnose this 100% without looking at the care but luckily you can use this link to find a good shop near you. https://repairpal.com/repair-shops Alex