Do you mean the graphics which are part of the motherboard or a separate graphics card?
There are a selection of both here which may help, but a bit more information such as motherboard or graphics card make and type and the symptoms would help.
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Synology invite you to their launch event on 16th September 2015. See the unveiling of the new DSM and products live, plus a chance to win a populated NAS! Tickets are free and available now. Click HERE for more details