Operating system not found

1. HDD is SATA
2. It did recognize it until today, now when I try and run a self test it tells me there is No IDE device. I purchased the drive less than a month ago, I don't think it failed, it should be something else.
3. No, I have not tried that, how can I do so?

Thank you for helping me

Well after it boots up, it worked fine. And it's brand new, I don't think that is the issue, but one can never know

OK, first of all, if your mobo is looking for an IDE device, you have to go into your BIOS and emulate PATA/IDE. Although this doesn't explain why you were able to load from the SATA without intervention previously.

Motherboards typically come equipped with 4-6 SATA ports; all are identical. The deal with SATA is that it absolves the need to differentiate between master and slave; this is now handled in the BIOS-you can select witch boot device to load from first; just the same as you can select your boot priority.

To change the SATA port (although I don't think your problem is as simple as this), open your case, locate your HDD. Identify the SATA cable by following the cable that is connected to your HDD and leading to the motherboard. After you've traced the cable back to the motherboard, remove the motherboard-end connection, and then simply put the cable into any other SATA port.

ok, from experience this problem can be fixed by rebooting from the cd and choosing the repair windows option. if it does not work then you will need to do a reformat, remember that if you do a reformat all your data will be lost. most likely your boot record on the HDD is corrupt due to faulty memory or overclocking. this has happened to me a few times before, that's why i have an external HDD for a back-up.

Thanks guys, will see what I can do. Btw, every now and then I also get a Hard disk read error problem, so I guess it's the hard drive

why does everyone say that it's in the bios? today's bios settings are dummy proof and will detect and change irq's on it's own, if the HDD worked before then it's not the bios. The bios chips are very robust. Like is said before, it cold be that your boot partition on the HDD is corrupt and most likely you will need to do a repair or reformat.

While I agree that the BIOS writers are getting better and better, the reason I'm telling the OP to check the BIOS is very simple: if the HDD is seen in the BIOS, then the motherboard can be ruled out as the problem. Checking the BIOS, as fool-proof as you may believe it to be, is still just as possible to fail as any hardware, and is a far more effective way to troubleshoot.

Let's put it in this perspective. When your vehicle is acting funny, would you simply buy new parts just to guess and hope that it gets fixed? No, you wouldn't, because it isn't very practical. Rather, you'd have the vehicle checked by professionals (or hobbyists that you trust) to determine where the problem is. Similarly, just because the error message of OS not found doesn't immediately warrant the purchase of a new HDD. Buying a new HDD just because of this message would be the same as you buying a new engine when the check engine light illuminates.

Thanks for the help guys, but I managed to figure out what the problem was. After a lot of changes and a few restarts, my computer finally started yesterday, and I was able to use it. I have read somewhere that if you have an older computer and you put a new HDD in, if you fill it up with data more than 135 GB or so, sometimes the BIOS settings get stuck on different ends of the drive and it is unable to boot. So I shrinked my 250 GB drive to one 100 GB and one 150 GB and today when I turned on the computer, it started like it should for the first time in a week. I guess that was my problem. Come to think of it, I started getting troubles only after I filled up my HDD with lots of stuff, so I guess that affected booting up.