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POST: Power On Self Test
POST is a PROM-resident piece of software that resides in the on-board ﬂash PROM of the I/O board. POST performs simple, component level, hardware fault detection and isolation tests on the server hardware.
When you say: "....Recently when the server is rebooted....". Rebooting means that Server will go into POST. So I guess this is the why you see that "screen goes blank". POST output is redirected to the serial port.
With the RSC configured you will be able to see POST in the console and check for any HW condition. Actually I will suggest that you install it. It will help you in a future to detect the root cause of unexplained reboots, system crash, etc.