Serious problem! No picture on screen.

[neelchauhan]

I have a test PC with a Pentium 4 CPU 1.3GHz, Intel D850GB, Nvidia GeForce 2 card, Western Digital 30.7GB hard drive, Goldstar CD-ROM, 512MB RAM(4*128MB), 3Com 3C905TX network card, Dynex FDD and Windows XP Professional SP2. No picture is displaying on the screen even though the fan is working.

The motherboard has a LAN and Audio controller, LAN is disabled in the BIOS. My father said it is the Hard drive but I don't believe so. The BIOS boot-up screen has a System builder OEM logo on it and the Video card is from Dell. I got the CPU, motherboard, and NIC from eBay. FDD and RAM from Amazon.com. The NIC is from a garage sale. The rest I had from disassembled PCs.

Some picture displayed earlier. How can I fix it?

[Aardobard]

You should get a post screen even without a hard drive connected.  If you are getting no picture at all, it can be caused by a bad motherboard, a bad CPU, a bad video card, bad RAM or a bad connection.

If things worked recently and now they no longer do, I would check connections, RAM, motherboard and CPU in that order.  The best way to test hardware is with spare hardware, if you don't have that available, ask some friends. 

[techblue]

Specifically could be a video card issue, but like aardobard said try checking the connections to the ram, motherboard and cpu.

Also the parts you bought.. do they work in another pc, because i did notice you mentioned getting a couple of them from ebay.