HP Pavilion H8 GPU upgrade PLEASE HELP

[kb11120]

Hey users, I recently purchased an EVGA GTX 750TI after being told that it was compatible with my pc. I am now finding out after installing it and hearing beeping at startup then followed by a shut down, that it is in fact not compatible with my motherboard. I am wondering on what would be a good GPU upgrade for my pc given my standard motherboard and low PSU. IT MUST BE COMPATIBLE. I am aware that most GPUs require a new PSU, so if the one you suggest does require a new psu please make that clear. My current GPU is the Radeon 7450 (I know its horrible).
My specs are on this website: http://h20565.www2.hp.com/portal/site/hpsc/template.PAGE/public/kb/docDisplay?javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken&javax.portlet.prp_ba847bafb2a2d782fcbb0710b053ce01=wsrp-navigationalState%3DdocId%253Demr_na-c03038580-14%257CdocLocale%253D%257CcalledBy%253D&javax.portlet.tpst=ba847bafb2a2d782fcbb0710b053ce01&ac.admitted=1394073257333.876444892.492883150

 

[kb11120]

Also my pc was refurbished to 8gb ram and an i5 2.7GHz processor. Thanks ahead of time!

 

[Ron Schneider]

bump