This message was posted on behalf of Intel Corporation
Thank you for contacting the Intel Communities.
As per the processor's specifications, it supports up to 2 displays: http://ark.intel.com/products/78868/Intel-Pentium-Processor-J2900-2M-Cache-up-to-2_67-GHz
(Under Graphics specifications).
Please make sure to use straight connections (HDMI to HDMI, VGA to VGA, no adapters) to avoid issues while doing this.
If any additional questions or inquiries are present, feel free to contact us back.