Hello! When I booted my desktop computer, it freezed at the "Acer" logo, at startup. I tried to go in Safe Mode but it doesn't respond to any command. I pressed Delete, F12, F2 and all the Fs and there's no difference. Then, i thought it was because of the dust inside. I cleaned it, restarted it and nothing changes. I unplugged the Hard Drive with the hope ill get in the BIOS, but nothing changed. Any help? P.S. My computer is an Acer Aspire AST671-EP820A.