I built my computer several years ago and have been slowly buying new parts to replace. My power source died in Dec 11 so I had FRYS replace it. They informed me my harddrive was dying & I needed to replace it. I saved up and bought a new DRIVE.

I put in the new drive along with the old one in hopes of cloning my old drive before it died. Computer would turn on, fans came on, mobo's fan came on, but nothing else. Monitor, peripherals would not register (no lights on keyboard, no light on mouse, monitor says there's no input signal).

Figured I messed something up, so I removed new harddrive and tried using old set up. Same problem. Removed old drive, figured I would just boot clean with new drive. Put in new drive; no change. Additionally, my DVD drive will no longer open.

Wasn't sure what the problem was. Put Windows 7 on a USB and tried powering on computer with USB in order to have a clean boot. Nothing. Computer does make one beep, but no other response.

I have had issues with all my peripherals before. Sometimes the mouse and keyboard (both USB) won't work in certain SLOTS. The monitor sometimes says it can't find an input signal, but when I restarted in the past, it would magically find the input signal. I've attributed these problems to the failing harddrive, but I'm not so sure now. I have switched which port the monitor cable goes into and which USB the keyboard and mouse go into with no response.

I've been struggling with this for a while and I am going crazy!!

Here's the specs of my computer:

Gigabyte motherboard (GA-P35-DS3L)
Intel Code Duo E4500, 2.20 GHz, 2MB L2 Cache, 800 MHz FSB
4GB Crucial RAM, 800MHz
EVGA NVIDIA 8600GT graphics card
HP w1907 19-inch Widescreen LCD Monitor

Here's what I've been hoping to put in my computer (I'd be happy if just the freaking harddrive would work):

ZOTAC ZT-50403-10L GeForce GTX 550 Ti (Fermi)
SEAGATE Barracuda ST1000DM003 1TB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive
OCZ AGILITY 3 AGT3-25SAT3-90G 2.5" 90GB SATA III MLC SSD

I'm not super computer-savvy, but I can usually figure things out if given direction.

I would appreciate any help before I chuck everything off my balcony.