My gateway 510x keeps shutting itself off. Sometimes after 5 minutes of booting up sometimes after 30 seconds. What could be the problem? Tried removing dust from the inside but that did not help.

check power settings see if program set

try to fasten screws at back of the unit ,
may sound like BS but if amp board don`t have good ground connection it can go in protection mode

happend to me on RX-V592

Possible error inthe phone showing a blank, can be failure of the display , failure of the hardware in main board. But sometimes reloading software can solve.
Just for final word, remove battery and keep aside ffor 30 minutes. then replace and test.

You said you tried different CPU, but it was the same motherboard, right? Maybe the motherboard speed (data bus, etc.) is just slow. Otherwise, there's not much left to try if the hard drive works OK in another computer and you've tried upgrading the memory, CPU, and power supply.

this seems like a software issue . if you can not run your system but ift works fine in safe mode try to run a system restore from factory disks and see where that gets you,

Green light flashes 5 and then red light flashes 6

it is't a virus, it could be your powersupply is going dead or theres a bad connection with the motherboard and powersupply or memory

Try and clean the filters or the plastic fan guards.

36" electric wolf brand cooktop. Goes off completely after just few seconds sometimes 30 sec. sometimes minute..Repair man looked at it-thinks either something electrical or some sensor messed up.He took apart look at electric ribbon nothing looked over puts back together..turns on and it goes completely blank again..no error codes..any suggestions