This will be long, but I hope somebody will have some ideas for me and others with similar problems, or maybe writing it up will make me think of something. My HP PC (Win XP home edition, SP1) from late 2002 has been running slow the past couple months. I realized recently that it may be due to the hard drive filling up- about 95% of capacity, so much that Windows defrag says it doesn't have enough free space to run. I've scanned for spyware, have a hardware firewall, always have antivirus software running, etc., so I don't think it's something malicious. Since it only has 1 physical hard drive, I thought the solution was to get a 2nd one & move a bunch of stuff there to free up space on the main drive. I've installed drives before, so this should not be a big deal, although the last time was in the mid 90s, so maybe there is something I'm missing. I do know enough to unplug things & ground myself, although static electricity seems pretty rare where I live (maybe due to high humidity?). I bought a Maxtor 160GB Ultra ATA drive. I had already checked to make sure I had a spare drive bay & unused power & ribbon connector on my drive cable. The old drive (also a Maxtor) already had the jumpers set for master, as far as I could tell, which makes sense because it was the drive that came with the PC, so how else would it have been set up? The new manual says leave the jumpers off the new drive to use it as the slave drive. I got it all connected, hooked up the power cable, turned on the monitor & PC. The PC beeped a bunch of times, the green power light on it came on for a while, but the monitor never seemed to receive a signal. My monitor (which came with the PC) has a light that's amber when the PC is off, green when it receives a signal. The screen stayed completely black like it wasn't even plugged in. Here's what I've tried since then. I'm still not able to get anything to appear on the monitor- none of the stuff you'd expect to see on screen when a PC is powered on. For most of these attempts, the amber light on the monitor never turns to green, but for a few it does, briefly. In all cases, the PC shuts itself off within 30 seconds or less. For each step below, I removed the power cable to the PC, did the step, hooked it back up & turned on the PC, with the results I just mentioned. 1. Replaced the ribbon cable with the one that came with the new drive, which the instructions recommend doing, although they seem to be the same thing. 2. Looked up the old drive on Maxtor's site & couldn't find a jumper diagram matching how the jumpers were installed on the drive. Changed the jumper on the old drive to what the new manual says is the setting for master, which is the same as the online info for the old drive. 3. Removed the power & ribbon cables from the new drive, leaving just the old one connected. 4. Put the Maxtor MaxBlast CD (which came with the new drive) in my DVD drive & tried to boot from that, although I really don't know if my BIOS is configured to even try booting from that drive. This was one of the times I got the green light on the monitor briefly. 5. Same thing with Windows XP CD that came with the PC, a CD that had been in shrinkwrap til now. 6. Same as #5, but with the new drive set up as the master, hoping I could set it up as the primary drive. By this point my focus has gone from installing a backup hard drive to trying to salvage the PC and old HD. 7. Same as #6, but with the jumper set for cable select, rather than master, which the manual suggests. 8. Tried booting from old Windows 95 bootable floppy I found, although I can't say for sure that diskette is still any good. 9. Reconnected the old drive with the old cable & old jumper settings, everything as before, except the new drive is still in the bay, just not connected to anything. This is where I am low on ideas- does it sound like some other PC component is dead here? When it tries to boot, the fan runs, & it makes the normal booting sounds, then shuts itself off. What else should I try? My next step is making a bootable floppy from the Maxtor CD. The DVD drive requires power for the drawer to open, & I'm able to do that during the brief period when the PC is on, so I guess that means the power supply is functioning. I don't mind replacing the PC so much if it comes to that, especially if I can salvage the old drive long enough to copy stuff off it. I'd just like to see if there's something I haven't thought of that would fix this, even temporarily. I'll add anything else I try, just wanted to post this now. Thanks.