I have a Hp Pavilion a1400e with an 80 GB hdd, 1.8 amd sempron 3000+ with 512 SHARED memory.  Just today when my brother was turning it on, it would GO to the windows boot screen, then to a bsod. Safe MODE, normal, last configuration that worked all got the same thing.  I got it to the hp recovery and ran PC-Doctor.  Everything was fine but the hard drive.  It failed the test.  So here's my question.  Should I just replace the hdd, or should I replace the whole computer?  It is old and pretty out of date.  I don't use it, my brother does.  He only wants to use internet, and low fps games.  When it was working, it could not handle the internet.  Also, how do you think I got to the recovery, which is on the hdd?  Because it failed all tests.  But the recovery still works.

Suggestions?
If the diagnostics your ran are the ones the manufacturer recommends, I would think the hard drive is on the way out. Now is your moment to take action.
If the PC is under warranty, call it in. Have serial # and service code at hand.

But if not, the HDD may still be under warranty.Five years or more. Do check with the support desk for you machine and see what they say about HDD replacement. Important: The is a reason to check with the support for your PC first. They nay have a story you want to hear before you contact the maker of the HDD.

In general, HP support is very good. If you can get to them. Low fps games.... you mean like 2 fps on combat arms?
Hdds are cheap... sata I think?
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136195

Or  you could sell it and get a new one which is what I would dowell the computer had a 1 yr warranty, which expired, what, 3 years ago.  And it is ALWAYS slow.  Even after a FRESH reinstall.  Hook it up as a slave drive immediately and backup all important data...
Slave Drive Tutorial.]http://www.dtidata.com/resourcecenter/2007/04/23/how-to-slave-hard-drive/]Slave Drive Tutorial.

You may not have too many chances...Something tells me he doesnt have any important data besides his brothers goat pr0n collection...... Quote

Something tells me he doesn't have any important data besides his brothers goat pr0n collection...