hi there! ive purchasse mikrotik router RB760 and used for 11 days but this morning i detected that no client get connected to my hotspot and when i check for the problem, i noticed this mikrotik is keep beeping startup sound then turn off and powerup itself and beep and turn off and sequence proceed like that.
any assistance there
I would try if it does the same with another power adapter, in some cases the PSU's fail in such a way that while they actually still provide the voltage (with no load) they cannot anymore provide it when some load is used (and booting a device is usually a load peak).
Ifr the power supply is good, you may want to try a reset (I hope you have a backup of the current configuration as it will be lost).
A reset router (with a working power supply) should be booting normally.
Remember that Mikrotik devices have two bootloaders, see here:
There is still the possibility of netinstall, but that is already tricky on a working device, on one that is not fully booting or not booting correctly it would be even worse, let's call it "last last resort".
With the little data provided, "hotspot" = you've run out of space on the internal NAND flash memory...
Use netinstall (=lost all) for restore the device