Dell Dimension 8400

[Guest]

Hello,
My Dell was running perfectly. I turned it off for a couple of months. When I turned it back on nothing at all happens. A friend said it could be the power supply. I looked inside and found a lot of dust. Don't know what the internal power supply looks like. Can anyone help?

 

[aford10]

This is what your PSU looks like.
http://images.google.com/imgres?imgurl=http://www.splusdirect.com/images/products/detail_25_Y2682.jpg&imgrefurl=http://www.splusdirect.com/index.php%3Fl%3Dproduct_detail%26p%3D25&usg=__mILcKZvSgHHJHVmTl2qvIWLwZNs=&h=214&w=250&sz=35&hl=en&start=60&um=1&itbs=1&tbnid=JMb69E8L3OtM0M:&tbnh=95&tbnw=111&prev=/images%3Fq%3DDimension%2B8400%26start%3D54%26um%3D1%26hl%3Den%26safe%3Dactive%26sa%3DN%26rlz%3D1G1GGLQ_ENUS309%26ndsp%3D18%26tbs%3Disch:1

If the cables are all secure, and you get no signs of life from the PC, the PSU is a likely cause. Before replacing the PSU, try removing the battery for ~5 minutes.
http://images.google.com/imgres?imgurl=http://ww2.justanswer.com/uploads/lifesaver333/2009-05-01_111404_battery.jpeg&imgrefurl=http://www.justanswer.com/questions/21xuf-i-have-a-dell-gx280-sff-pc-with-os-xp-the-former-owner-added&usg=__x7_nRsAAhJD8hYb5AZeKodpxVZU=&h=302&w=291&sz=24&hl=en&start=2&um=1&itbs=1&tbnid=Ru-VVQj6NYTvxM:&tbnh=116&tbnw=112&prev=/images%3Fq%3Dcmos%2Bbattery%26um%3D1%26hl%3Den%26safe%3Dactive%26rlz%3D1G1GGLQ_ENUS309%26tbs%3Disch:1