Unable to start SAP instance in MMC

Hi Experts,

We have installed SAP ECC EHP 6 on Oracle11.

Till yesterday we were able to start SAP from MMC.

We have installed add on as XECM, it finished yesterday but still we were able to access SAP.

But suddenly today we are not able to start SAP from MMC, it becomes yellow again it get backs to grey.

So need your assistance on this.

Thanks in advance.

Regard,

Akshay