EggXpert

I think i have a weak PSU, because it sometimes wouldn't boot up.

When i turn on the computer, i can hear the fans running loud, but nothing comes up.

if i try resetting it couple of times, then it will work.

i think i have a weak PSU for my system.

please see my specs below, and see if the PSU i have is the problem. i also need new, affordable PSU suggestions. thanks!!

(ignore the price tags, they are from last year) 

Track	1	GIGABYTE GA-P35-DS3L LGA 775 Intel P35 ATX Intel Motherboard - Retail Item #: N82E16813128059 Return Policy: Limited 30-Day Return Policy	$96.99
Track	1	Seagate Barracuda 7200.11 ST3500320AS 500GB 7200 RPM SATA 3.0Gb/s Hard Drive - OEM Item #: N82E16822148288 Return Policy: Limited 30-Day Return Policy	$119.99
Track	1	Intel Core 2 Duo E6750 Conroe 2.66GHz LGA 775 65W Dual-Core Processor Model BX80557E6750 - Retail Item #: N82E16819115029 Return Policy: Processors (CPUs) Return Policy	$189.99
Track	1	Arctic Silver 5 Thermal Compound - OEM Item #: N82E16835100007 Return Policy: Consumable Items Return Policy	$5.99
Track	1	XFX PVT88PUDF4 GeForce 8800GT 256MB 256-bit GDDR3 PCI Express 2.0 HDCP Ready SLI Supported Video Card - Retail Item #: N82E16814150264 Return Policy: Standard Return Policy	$209.99
Track	1	Thermaltake Purepower W0100RU ATX 12V 2.0 500W Power Supply - Retail Item #: N82E16817153052 Return Policy: Standard Return Policy	$59.99
Track	1	ARCTIC COOLING Freezer 7 Pro 92mm CPU Cooler - Retail Item #: N82E16835186134 Return Policy: Standard Return Policy	$21.99
Track	1	LG 20X DVD±R DVD Burner with LightScribe Black E-IDE/ATAPI Model GSA-H55LK - OEM Item #: N82E16827136134 Return Policy: Standard Return Policy	$29.99
Track	1	G.SKILL 4GB(2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL4D-4GBPK - Retail Item #: N82E16820231148 Return Policy: Standard Return Policy	$124.99
Item(s) shipped from TN       Tracking Number: #1ZR4149E0303665571
Track	1	COOLER MASTER RC-690-KKN1-GP Black SECC/ ABS ATX Mid Tower Computer Case - Retail Item #: N82E16811119137 Return Policy: Standard Return Policy

well, 500watts is plenty for your system, but it would seem that you have a low-quality power supply, unable to supply the wattage it's rated for.  You can read a review of a Thermaltake PurePower at HardwareSecrets.com.  You'll see that the power supply was rated for a much higher wattage than it could actually deliver, and had terrible ripple suppression even at loads it was able to run. 

As for a new affordable PSU, the OCZ StealthXStream 600watt power supply is currently on sale for $50 at newegg.com, with free shipping.  That's a high quality power supply that has more than enough power to run your computer, even if you were to overclock. That power supply was also reviewed at HardwareSecrets, with much more positive results.  In fact, they found that the OCZ StealthXStream 600watt power supply was actually capable of putting out a full 728watts, amazingly enough.  I'd recommend getting one of those soon, before the sale expires or the price goes up. 

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Yes that is a weak PSU with 2 rails and only 14 amps per rail. Here are some good quality PSUs that will do the job and are in the top 2 teirs.

http://www.newegg.com/Product/Productcompare.aspx?Submit=ENE&N=2000320058%201131509966%201230113790&bop=And&Order=PRICE&CompareItemList=N82E16817703015%2CN82E16817139004%2CN82E16817139005%2CN82E16817703005