Inspiron 530, video card replacement

[Zusa]

Over the summer my neighbor asked if I could look into fixing their computer because it "suddenly stopped working."  Turns out, all she needs is a graphics card but the thing is I am almost clueless about replacing hardware on a computer. It's a refurbished Dell Inspiron 530 Tower, Vista 64 bit.  I believe, if memory serves from what another friend told me, the card I need will have to be 124 pin count.  I saw somewhere in the forums from google, someone was also looking to replace their graphics card for their Inspiron 530 tower - and someone posted a link from Dell for the card they needed, but that card is no longer in stock.  It sounded like based on what I saw in the conversation that you could get this card for under $50 (I have no idea what a good price is for parts - I'm more of  the person you come to if you need some help with viruses and speeding up your computer). Any help would be greatly appreciated. 

[DELL-Chris M]

Below are the Dell validated PCIe x16 video cards and their Dell part number using our 250w power supply =
F342F ATI Radeon HD3450 ML112, 256MB, DVI/HDMI
F343F ATI Radeon HD3450 ML112, 256MB, Low Profile, DVI/HDMI
XX355 ATI Radeon HD2400 XT OPGA5, 256MB, Low Profile, DMS-59/TV Out
XX347, YP477 ATI Radeon HD2400 Pro OUGA5, 256MB, Low Profile, DVI-I/TV Out
KT154 ATI Radeon X1300 Pro OPGA4, 256MB, Low Profile, DMS-59
JW592, DR280 ATI Radeon X1300 OUGA4, 128MB, Low Profile, DVI/TV Out
YU284 Nvidia Geforce 8300 MRMGA11B, 128MB, Low Profile, DVI/VGA