raybay said:
When you have multiple failures of various components, you must suspect the power supply
I'm sorry to interject but... Not to say that there isn't one, but I haven't taken apart/ seen schematics of a laptop yet with a PSU. From what I've seen, power is delived to components via the same ports into which they are "seated" rather than being connected through a cabling system.
@Edwin Phate
Is this consistent regardless of your power source?
i.e Whether the laptop is plugged in or running off of battery power?
raybay is correct in that your laptop's symptoms could be caused by failure to receive adequate power to components, and the AC adapter which is integrated into most laptop motherboards has been known to fail.
If you can, I'd try the basics, reseat your RAM, try a test hard drive if you have a spare, etc.
Other than that, depending on the age of your system, it might be checking out piece by piece, or the motherboard itself might be dieing slowly.
Personally though, I'd say it would be very unsual to have so many components fail in such a short period of time, and look for a universal factor in component failure.
What integrates all of your laptops components? Well, since there's no PSU per se in a laptop, the universal link is the motherboard.
Laptop boards aren't built to any industry standard that I'm aware of, and thus are model specific to laptops.
i.e. Your replacement options would be limited to the identical board you already had, and pricing for laptop boards usually starts around $150, even for older models.
Unless you have spare laptop components lying around your house, diagnosing a laptop problem like a failing motherboard can be complex, and most definitely requires some extent of system disassembly.
If you really like your laptop, you may need to take the laptop to a local repair shop or Best Buy and explain the failures that you've experienced, and request to leave the laptop for diagnostic testing.
If you decide that this is the route for you, I suggest you read this short, but enlightening, article first:
http://www.thedenverchannel.com/call7investigators/16023394/detail.html
Things like this tend to be somewhat universal, I wouldn't assume you're safe just by not living in Denver.
For now, I'll see what I can dig up about the laptop model you listed, the "HP Dv1040us".