Black screen with blinking _ sign

MUS1CFR34K

Reputable
Jan 2, 2015
1
0
4,510
intel pentium 4 3.00 ghz
nvidia gt 210
2 gigs of ram
hard drive;samsung SP0802N

Greetings
so I was trying to install a second hard drive and after I've set it up and booted the pc I keep getting this screen I tried removing the hd but the problem persists also sometimes I get a error that says cmos battery has failed I already tried replacing it but that didn't do anything
everytime it displayed the error time in bios got reset it stopped doing that now yet it makes me uncertain what the real fault is I already tried taking out my main drive and only inserting the secondary when I did that it actually gave me a error screen indicating that windows xp has crashed and gave me options in which way to boot first I tried normal boot but i got a bsod so I tried safe mode but I still got a bsod after a restart it went right back to the black screen with a blinking _ sing also my dvd drive used to work fine it can still open and close yet is not recognized in bios but both hard drives get recognized I'd appreciate any advice you can give me

 
First advice: Get the story straight.
You said
I already tried taking out my main drive and only inserting the secondary
and added:
when I did that it actually gave me a error screen indicating that windows xp has crashed and gave me options in which way to boot
So does the secondary drive have Windows Xp installed? This is abnormal behavior for an added drive you may have had just laying around, or just bought. You failed to say what the drives are.. Serial ATA? Parallel? master/slave if parallel? I did some of your homework and found the samsung SP0802N is a parallel drive so the master/slave pin must be set correctly on both drives if they share a common IDE cable, or can both be set to Master (or "single" as some drives will indicate) if on separate channels, one drive per cable.

Your question is mis-leading and ambiguous at best. If you did not have the master/slave pins set correctly on a shared IDE cable, a set of logical mis-matches occurred that may have destroyed the output drivers of one or both drives and perhaps even the mainboard IDE interface chips.
Check everything again. Set master/slave pins on the drives correctly. The master should be the drive that worked and the slave being the new added drive, unless using 2 IDE ports, and in that case, jumper both drives as master (or single). Set the computer BIOS boot order to boot the original drive first. The drive probably has a sticker that shows how to set the jumpers.
Try these things and see what happens.