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Possibly it is overheating, which would depend on how often it runs, and how fast. During startup, it is normal for a fan to run at high speed, but if it's on constantly in sleep mode, I would look towards an overheating problem. Open it up, check for, and clean any dust around the heatsink / fan, and power supply fan. Also make sure that outside the PC there is plenty of space to allow airflow.
Ok it still sounds like an fan. look for fans, one in power supply, one on cpu, one in case(frount or back), one on video card. before you start from cold unplug the fans that you can. and stop the one in power supply. then if there is no nosie you have to start pluging them back in till you hear the noise. **NOTE!!** don't run it long without fans!!( 40 secs) is long enough..
sounds like it could be a bearing in your hard drive. is this problem constant? If so, I would open up the tower and disconnect the hard drive and then power up the tower again. if the sound goes away--you need to get a new hard drive. If not, you could have some dust bunnies in your cooling fan.
Open up the side of the tower and you will be able to see the fans. You most likely have dust/hair in one of your fans or one of the fans is going bad. You can clean it out with a low pressure air nozzle or dust can.
Constant rebooting of a computer can be cause by alot of reason the most common for this is due to oevrheating, to check if this is a overheating problem try to open the case of the tower and put a electric fan in front of the tower to coll it down then power ON thecomputer and if it booted up fine with a electric fan blowing on the tower we're sure that you need to add some colling device on the computer tower, But if still do the same thing the problem here is the power supply unit it needs a replacement already....